Document:

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                                                                    EXHIBIT 10.1

      THE WARRANTS EVIDENCED HEREBY WERE ISSUED IN A TRANSACTION THAT WAS NOT
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "SECURITIES ACT"),
OR ANY STATE OR OTHER SECURITIES LAW. THE HOLDER HEREOF, BY ACQUIRING THIS
INSTRUMENT, AGREES FOR THE BENEFIT OF VOCUS, INC. (THE "COMPANY") THAT THE
WARRANTS EVIDENCED HEREBY MAY BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED ONLY (A)
(1) PURSUANT TO AN AVAILABLE EXEMPTION FROM REGISTRATION UNDER THE SECURITIES
ACT AND UNDER ANY APPLICABLE STATE OR OTHER SECURITIES LAWS, AND, IF REQUESTED
BY THE COMPANY, A LEGAL OPINION REASONABLY SATISFACTORY TO THE COMPANY THAT SUCH
TRANSACTION IS SO EXEMPT OR (2) PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT
UNDER THE SECURITIES ACT; AND ANY APPLICABLE STATE OR OTHER SECURITIES LAW.

      THE WARRANTS EVIDENCED HEREBY AND THE SECURITIES ISSUABLE UPON EXERCISE
THEREOF ARE SUBJECT TO A WARRANT PURCHASE AGREEMENT DATED AUGUST 24, 2001
BETWEEN THE COMPANY AND PNC BANK, NATIONAL ASSOCIATION (AS THE SAME MAY BE
SUPPLEMENTED, MODIFIED, AMENDED OR RESTATED FROM TIME TO TIME, THE "WARRANT
AGREEMENT"). A COPY OF THE WARRANT AGREEMENT IS AVAILABLE FOR REVIEW AT THE
PRINCIPAL OFFICE OF THE COMPANY.

                         COMMON STOCK PURCHASE WARRANTS

No. W.-_________________
DATE OF ISSUANCE: AUGUST 24, 2001

      Capitalized terms used and not otherwise defined in this instrument shall
have the meanings assigned to them in the Warrant Agreement. The Company
certifies that PNC BANK, NATIONAL ASSOCIATION is the Holder of 38,628 warrants
(the "WARRANTS") to purchase fully paid and nonassessable shares of the common
stock of the Company, par value $0.01 per share (the "COMMON STOCK"), upon the
terms and subject to the provisions of the Warrant Agreement and this instrument
(the "WARRANT CERTIFICATE"). The Exercise Price shall initially be $1.618 and
each Warrant shall be exercisable for one share of Common Stock. The Exercise
Price and the number of Warrants evidenced hereby shall be subject to adjustment
as provided in the Warrant Agreement. The Warrants evidenced hereby shall be
exercisable at any time and from time to time until the close of business on the
Final Expiration Date.

1.    EXERCISE OF WARRANTS.

      1.1 Each Warrant evidenced hereby may be exercised by the Holder of this
Warrant Certificate at any time by surrender hereof to the Company, together
with the Exercise Form, in the form attached hereto as Annex 1 (the "EXERCISE
FORM"), duly completed and executed and payment of an amount equal to the
Exercise Price multiplied by the number of Warrants being exercised. At the
option of the Holder hereof, payment of the Exercise Price may be made by either
(i) cash, (ii) a certified or cashier's check payable to the order of the
Company, (iii) exercise of the net issuance option pursuant to Section 1.4, or
(iv) any combination of the foregoing methods. Upon the Company's receipt of
this Warrant Certificate, the duly completed

                                       A1

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and executed Exercise Form and the requisite payment, the Company shall issue
and deliver (or cause to be delivered) stock certificates representing the
aggregate number of shares of Common Stock being purchased. In the event that
less than all of the Warrants evidenced hereby are being exercised, the Company
shall issue and deliver (or cause to be delivered) a new Warrant Certificate or
Certificates at the same time such stock certificates are delivered. That new
Warrant Certificate or those new Warrant Certificates shall entitle the persons
in whose names they are registered to exercise in the aggregate the number of
Warrants not exercised in that partial exercise and shall otherwise have the
same terms and provisions as this Warrant Certificate.

      1.2 In the event that the Holder of this Warrant Certificate desires that
any or all of the stock certificates to be issued upon the exercise of any
Warrants evidenced hereby be registered in a name or names other than that of
such Holder, such Holder must so request in writing at the time of exercise, and
the Holder shall comply with Section 10 of the Warrant Agreement (Restrictions
on Transfer) before the Company shall be obligated to so register such stock
certificate. In addition, such Holder must remit to the Company funds sufficient
to pay all transfer taxes (if any) payable in connection with such delivery of
such stock certificates or prove, to the reasonable satisfaction of the Company,
that no such taxes are payable in connection with such transaction.

      1.3 Upon due exercise by the Holder hereof of any Warrants evidenced
hereby, whether in whole or in part, such Holder (or any other person to whom a
stock certificate is to be issued) shall be deemed for all purposes to have
become the holder of record of the shares of Common Stock for which those
Warrants have been so exercised effective immediately prior to the close of
business on the day this Warrant Certificate, the duly completed and executed
Exercise Form and the requisite payment are duly delivered to the Company,
irrespective of the date of actual delivery of the stock certificates
representing such shares of Common Stock.

      1.4 Notwithstanding anything to the contrary set forth herein, if the
current market value of a share of Common Stock (determined in accordance with
Section 7(b) of the Warrant Agreement) is greater than the Exercise Price on the
Date of Determination, in lieu of exercising Warrants evidenced hereby for cash,
the Holder hereof may elect to receive shares of Common Stock equal to the value
(determined in the manner set forth below) of a designated number of such
Warrants by surrender of this Warrant Certificate at the principal office of the
Company together with a duly completed and executed Exercise Form. The "DATE OF
DETERMINATION" is the business day immediately preceding the day on which this
Warrant Certificate is being delivered to the Company pursuant to this Section
1. In such event, the Company shall issue to the Holder hereof a number of
shares of Common Stock computed using the following formula:

Y = X (A-B)
    -------
       A

Where:

A =   the current market value of a share of Common Stock on the Date of
      Determination (determined in accordance with Section 7(b) of the Warrant
      Agreement);

B =   the Exercise Price as of the close of business on the Date of
      Determination;

                                       A2

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X =   the number of shares of Common Stock purchasable upon exercise of the
      Warrants being cancelled if such Warrants were being exercised instead of
      being cancelled; and

Y =   the number of shares of Common Stock to be issued to such Holder.

2.    SURRENDER OF WARRANTS; EXPENSES.

      2.1 Whether in connection with the exercise, transfer, split-up,
combination, exchange or replacement of this Warrant Certificate or any Warrants
evidenced hereby, surrender of this Warrant Certificate shall be made to the
Company during normal business hours on a business day (unless the Company
otherwise permits) at the principal office of the Company located at 4296 Forbes
Boulevard, Lanham, MD 20706 or to such other office or to any duly authorized
representative of the Company as from time to time may be designated by the
Company by written notice given to the Holders of the Warrants.

      2.2 The Company shall pay all costs and expenses incurred in connection
with the exercise, transfer, split-up, combination, exchange or replacement of
this Warrant Certificate or any Warrants evidenced hereby, including the costs
of preparation, execution and delivery of Warrant Certificates and stock
certificates, and shall pay all taxes (other than any taxes measured by the
income of any person other than the Company) and other charges imposed by law
payable in connection with the transfer, split-up, combination, exchange or
replacement of this Warrant Certificate or any Warrants evidenced hereby except
as otherwise provided in Section 5(c) of the Warrant Agreement.

3.    WARRANT REGISTER; EXCHANGE; TRANSFER; LOSS.

      3.1 The Company shall, at all times, maintain at its principal office an
open register for the Warrants, in which the Company shall record the name and
address of each Holder to whom Warrants have been issued or transferred.

      3.2 Subject to applicable law and the provisions of the Warrant Agreement,
this Warrant Certificate may be exchanged for two or more Warrant Certificates
entitling the Holder hereof to exercise the same aggregate number of Warrants at
the same Exercise Price and otherwise having the same terms and provisions as
this Warrant Certificate. The Holder hereof may request such an exchange by
surrendering this Warrant Certificate to the Company, together with a written
request specifying the desired number of Warrant Certificates and the allocation
among them of the Warrants evidenced hereby.

      3.3 Subject to applicable law and the provisions of the Warrant Agreement,
this Warrant Certificate and the Warrants evidenced hereby may be transferred,
in whole or in part, by the Holder hereof. A transfer shall be effected by
surrendering this Warrant Certificate to the Company, together with an
Assignment Form, in the form attached hereto as Annex 2 (the "ASSIGNMENT FORM"),
duly completed and executed. Within five business days after the Company's
receipt of this Warrant Certificate and the Assignment Form so completed and
executed, the Company shall issue and deliver to each transferee a new Warrant
Certificate evidencing the number of Warrants being transferred to such person
and otherwise having the same Exercise Price and other terms and provisions of
this Warrant Certificate, which the Company will register in such new Holder's
name. To the extent applicable, the Company shall

                                       A3
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issue to the Holder hereof a new Warrant Certificate evidencing the Warrants not
being transferred to any person and otherwise having the same Exercise Price and
other terms and provisions of this Warrant Certificate.

      3.4 In the event of the loss, theft or destruction of this Warrant
Certificate, the Company shall execute and deliver an identical Warrant
Certificate to the Holder hereof in substitution herefor upon the Company's
receipt of (i) evidence reasonably satisfactory to the Company of such event
(with the affidavit of an institutional Holder being such sufficient evidence),
and (ii) if requested by the Company, an indemnity agreement from any
institutional Holder or an indemnity bond from any other Holder reasonably
satisfactory in form and amount to the Company.

4.    RIGHTS AND OBLIGATIONS OF THE COMPANY AND THE WARRANT HOLDER. The
Company and the Holder of this Warrant Certificate are entitled to the rights
and bound by the obligations set forth in the Warrant Agreement, all of which
rights and obligations are hereby incorporated by reference herein. This Warrant
Certificate shall not entitle its Holder to any rights as a stockholder of the
Company (other than as set forth in Section 1.3).

      IN WITNESS WHEREOF, the Company has caused this Warrant Certificate to be
executed by its duly authorized representative and attested to by its Secretary
or an Assistant Secretary.

ATTEST:                                          VOCUS, INC.

By: /s/ TIMOTHY S. BENDER                        By: /s/ Stephen Vintz
    --------------------------                       ---------------------------
Name: TIMOTHY S. BENDER                          Name: Stephen Vintz
Title: [VP & CONTROLLER]                         Title: CFO
                                                        [President]
                                                        [Vice President]

                                       A4

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                                     ANNEX 1

                                 EXERCISE FORM

      The undersigned Holder hereby irrevocably elects to exercise
_________________________________________ Warrants to purchase fully
paid and nonassessable shares of the common stock, [no] par value
[$______________] per share, of Vocus, Inc. (the "Company") and/or such other
securities or property as are purchasable upon exercise of such Warrants, and
hereby tenders payment for such shares and/or other securities or property by:

      (i)   enclosing cash and/or a certified or cashier's check payable to the
            order of the Company in the aggregate amount of $___________; and/or

      (ii)  hereby authorizing the cancellation of ___________________ Warrants.

Instructions for registering the securities on the stock transfer books of the
Company:

Name of Holder:______________________________________________________
State of Organization (if applicable):_______________________________
Federal Tax Identification or
   Social Security Number:___________________________________________
Address: ____________________________________________________________
         ____________________________________________________________

      If this exercise of Warrants evidenced by the attached Warrant Certificate
is not an exercise in full thereof, then the undersigned Holder hereby requests
that a new Warrant Certificate of like tenor (exercisable for the balance of the
Warrants evidenced by the attached Warrant Certificate) be issued in the name of
and delivered to the undersigned Holder at the address on the Warrant register
of the Company.

Dated: ___________________                    __________________________________
                                              (Name of Holder - Please Print)

                                              By: ______________________________
                                                 (Signature of Holder or of Duly
                                                       Authorized Signatory)
                                              Title: ___________________________

                                       A5

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                                     ANNEX 2

                                ASSIGNMENT FORM

      For value received, the undersigned Holder hereby sells, assigns and
transfers to the person whose name and address are set forth below all of the
rights of the undersigned Holder with respect to __________________ Warrants
evidenced by the attached Warrant Certificate.

Name of Transferee:__________________________________________________
State of Organization (if applicable):_______________________________
Federal Tax Identification or
  Social Security Number:____________________________________________
Address: ____________________________________________________________
         ____________________________________________________________

      If this transfer is not a transfer of all the Warrants evidenced by the
attached Warrant Certificate, then the undersigned Holder hereby requests that a
new Warrant Certificate of like tenor evidencing the Warrants not being
transferred pursuant hereto be issued in the name of and delivered to the
undersigned Holder at the address on the Warrant register of Vocus, Inc.

      The undersigned Holder hereby irrevocably constitutes and appoints
______________________________________ as his/her/its attorney to register the
foregoing transfer on the books of Vocus, Inc. maintained for that purpose, with
full power of substitution in the premises.

Dated: ___________________                    __________________________________
                                              (Name of Holder - Please Print)

                                              By: ______________________________
                                                 (Signature of Holder or of Duly
                                                       Authorized Signatory)
                                              Title: ___________________________

                                       A6<PAGE>

                                                                    EXHIBIT 10.2

THIS WARRANT AND THE SHARES ISSUABLE HEREUNDER HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED OR
OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT
OR PURSUANT TO RULE 144 OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE
CORPORATION AND ITS COUNSEL THAT SUCH REGISTRATION IS NOT REQUIRED.

                            WARRANT TO PURCHASE STOCK

Corporation:            Vocus, Inc., a Delaware Corporation
Number of Shares:       40,000
Class of Stock:         Common Stock
Initial Exercise Price: $0.82 per share
Issue Date:             November 19, 2002
Expiration Date:        November 19, 2009

      THIS WARRANT CERTIFIES THAT, for good and valuable consideration, the
receipt of which is hereby acknowledged, COMERICA BANK - CALIFORNIA or its
assignee ("Holder") is entitled to purchase the number of fully paid and
nonassessable shares of the class of securities (the "Shares") of the
corporation (the "Company") at the initial exercise price per Share (the
"Warrant Price") all as set forth above and as adjusted pursuant to Article 2 of
this warrant, subject to the provisions and upon the terms and conditions set
forth in this warrant.

                                    ARTICLE 1

                                    EXERCISE

      1.1 METHOD OF EXERCISE. Holder may exercise this warrant by delivering
this warrant and a duly executed Notice of Exercise in substantially the form
attached as Appendix 1 to the principal office of the Company. Unless Holder is
exercising the conversion right set forth in Section 1.2, Holder shall also
deliver to the Company a check for the aggregate Warrant Price for the Shares
being purchased.

      1.2 CONVERSION RIGHT. In lieu of exercising this warrant as specified in
Section 1.1, Holder may from time to time convert this warrant, in whole or in
part, into a number of Shares determined by dividing (a) the aggregate fair
market value of the Shares or other securities otherwise issuable upon exercise
of this warrant minus the aggregate Warrant Price of such Shares by (b) the fair
market value of one Share. The fair market value of the Shares shall be
determined pursuant to Section 1.4.

      1.3 RESERVED.

      1.4 FAIR MARKET VALUE. If the Shares are traded regularly in a public
market, the fair market value of the Shares shall be the closing price of the
Shares (or the closing price of the Company's stock into which the Shares are
convertible) reported for the business day immediately before Holder delivers
its Notice of Exercise to the Company. If the Shares are not regularly traded in
a public market, the Board of Directors of the Company shall determine fair
market value in its reasonable good faith judgment.

                                       1.
<PAGE>

      1.5 DELIVERY OF CERTIFICATE AND NEW WARRANT. Promptly after Holder
exercises or converts this warrant, the Company shall deliver to Holder
certificates for the Shares acquired and, if this warrant has not been fully
exercised or converted and has not expired, a new warrant representing the
Shares not so acquired.

      1.6 REPLACEMENT OF WARRANTS. On receipt of evidence reasonably
satisfactory to the Company of the loss, theft, destruction or mutilation of
this warrant and, in the case of loss, theft or destruction, on delivery of an
indemnity agreement reasonably satisfactory in form and amount to the Company
or, in the case of mutilation, on surrender and cancellation of this warrant,
the Company at its expense shall execute and deliver, in lieu of this warrant, a
new warrant of like tenor.

      1.7 REPURCHASE ON SALE, MERGER, OR CONSOLIDATION OF THE COMPANY.

            1.7.1 "ACQUISITION." For the purpose of this warrant, "Acquisition"
means any sale, license, or other disposition of all or substantially all of the
assets (including intellectual property) of the Company, or any reorganization,
consolidation, or merger of the Company where the holders of the Company's
securities before the transaction beneficially own less than 50% of the
outstanding voting securities of the surviving entity after the transaction.

            1.7.2 ASSUMPTION OF WARRANT. If upon the closing of any Acquisition
the successor entity assumes the obligations of this warrant, then this warrant
shall be exercisable for the same securities, cash, and property as would be
payable for the Shares issuable upon exercise of the unexercised portion of this
warrant as if such Shares were outstanding on the record date for the
Acquisition and subsequent closing. The Warrant Price shall be adjusted
accordingly. The Company shall use reasonable efforts to cause the surviving
corporation to assume the obligations of this warrant.

            1.7.3 NONASSUMPTION. If upon the closing of any Acquisition the
successor entity does not assume the obligations of this warrant and Holder has
not otherwise exercised this warrant in full, then Holder shall have the option
either to (a) deem this warrant to have been automatically converted pursuant to
Section 1.2 and thereafter Holder shall participate in the Acquisition on the
same terms as other holders of the same class of securities of the Company; or
(b) require the Company to purchase this warrant for cash upon the closing of
the Acquisition for an amount per Share equal to three (3) times the Warrant
Price.

                                    ARTICLE 2

                            ADJUSTMENTS TO THE SHARES

      2.1 STOCK DIVIDENDS, SPLITS, ETC. If the Company declares or pays a
dividend on its common stock payable in common stock, or other securities,
subdivides the outstanding common stock into a greater amount of common stock,
then upon exercise of this warrant, for each Share acquired, Holder shall
receive, without cost to Holder, the total number and kind of securities to
which Holder would have been entitled had Holder owned the Shares of record as
of the date the dividend or subdivision occurred.

                                       2.
<PAGE>

      2.2 RECLASSIFICATION, EXCHANGE OR SUBSTITUTION. Upon any reclassification,
exchange, substitution, or other event that results in a change of the number
and/or class of the securities issuable upon exercise or conversion of this
warrant, Holder shall be entitled to receive, upon exercise or conversion of
this warrant, the number and kind of securities and property that Holder would
have received for the Shares if this warrant had been exercised immediately
before such reclassification, exchange, substitution, or other event. Such an
event shall include any automatic conversion of the outstanding or issuable
securities of the Company of the same class or series as the Shares to common
stock pursuant to the terms of the Company's Articles of Incorporation upon the
closing of a registered public offering of the Company's common stock. The
Company or its successor shall promptly issue to Holder a new warrant for such
new securities or other property. The new warrant shall provide for adjustments
which shall be as nearly equivalent as may be practicable to the adjustments
provided for in this Article 2 including, without limitation, adjustments to the
Warrant Price and to the number of securities or property issuable upon exercise
of the new warrant. The provisions of this Section 2.2 shall similarly apply to
successive reclassifications, exchanges, substitutions, or other events.

      2.3 ADJUSTMENTS FOR COMBINATIONS, ETC. If the outstanding Shares are
combined or consolidated, by reclassification or otherwise, into a lesser number
of shares, the Warrant Price shall be proportionately increased. If the
outstanding Shares are combined or consolidated, by reclassification or
otherwise, into a greater number of shares, the Warrant Price shall be
proportionately decreased.

      2.4 ADJUSTMENTS FOR DILUTING ISSUANCES. The Warrant Price and the number
of Shares issuable upon exercise of this warrant shall be subject to adjustment,
from time to time, in the manner set forth on Exhibit A, if attached, in the
event of Diluting Issuances (as defined on Exhibit A).

      2.5 No IMPAIRMENT. The Company shall not, by amendment of its Articles of
Incorporation or through a reorganization, transfer of assets, consolidation,
merger, dissolution, issue, or sale of securities or any other voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed under this warrant by the Company, but shall at all times
in good faith assist in carrying out all the provisions of this Article 2 and in
taking all such action as may be necessary or appropriate to protect Holder's
rights under this Article against impairment.

      2.6 CERTIFICATE AS TO ADJUSTMENTS. Upon each adjustment of the Warrant
Price, the Company at its expense shall promptly compute such adjustment, and
furnish Holder with a certificate of its Chief Financial Officer setting forth
such adjustment and the facts upon which such adjustment is based. The Company
shall, upon written request, furnish Holder a certificate setting forth the
Warrant Price in effect upon the date thereof and the series of adjustments
leading to such Warrant Price.

                                       3.
<PAGE>

                                    ARTICLE 3

                  REPRESENTATIONS AND COVENANTS OF THE COMPANY

      3.1 REPRESENTATIONS AND WARRANTIES. The Company hereby represents and
warrants to the Holder as follows:

            (a) The initial Warrant Price referenced on the first page of this
warrant is not greater than the fair market value of the Shares as of the date
of this warrant.

            (b) All Shares which may be issued upon the exercise of the purchase
right represented by this warrant, and all securities, if any, issuable upon
conversion of the Shares, shall, upon issuance, be duly authorized, validly
issued, fully paid and nonassessable, and free of any liens and encumbrances
except for restrictions on transfer provided for herein or under applicable
federal and state securities laws.

            (c) The Company's capitalization table attached to this warrant is
true and complete as of the Issue Date.

      3.2 NOTICE OF CERTAIN EVENTS. If the Company proposes at any time (a) to
declare any dividend or distribution upon its common stock, whether in cash,
property, stock, or other securities and whether or not a regular cash dividend;
(b) to offer for subscription pro rata to the holders of any class or series of
its stock any additional shares of stock of any class or series or other rights;
(c) to effect any reclassification or recapitalization of common stock; or (d)
to merge or consolidate with or into any other corporation, or sell, lease,
license, or convey all or substantially all of its assets, or to liquidate,
dissolve or wind up, then, in connection with each such event, the Company shall
give Holder (1) at least 20 days prior written notice of the date on which a
record will be taken for such dividend, distribution, or subscription rights
(and specifying the date on which the holders of common stock will be entitled
thereto) or for determining rights to vote, if any, in respect of the matters
referred to in (a) and (b) above; and (2) in the case of the matters referred to
in (c) and (d) above at least 20 days prior written notice of the date when the
same will take place (and specifying the date on which the holders of common
stock will be entitled to exchange their common stock for securities or other
property deliverable upon the occurrence of such event).

      3.3 INFORMATION RIGHTS. So long as the Holder holds this warrant and/or
any of the Shares, the Company shall deliver to the Holder (a) promptly after
mailing, copies of all communiques to the shareholders of the Company, (b)
within ninety (90) days after the end of each fiscal year of the Company, the
annual audited financial statements of the Company certified by independent
public accountants of recognized standing and (c) within forty-five (45) days
after the end of each of the first three quarters of each fiscal year, the
Company's quarterly, unaudited financial statements.

      3.4 REGISTRATION UNDER SECURITIES ACT OF 1933, AS AMENDED. The Company
agrees that the Shares or, if the Shares are convertible into common stock of
the Company, such common stock, shall be subject to the registration rights set
forth on Exhibit B, if attached.

                                       4.
<PAGE>

                                    ARTICLE 4

                                  MISCELLANEOUS

      4.1 TERM: NOTICE OF EXPIRATION. This warrant is exercisable in whole or in
part, at any time and from time to time on or before the Expiration Date set
forth above; provided, however, that if the Company completes its initial public
offering within the three-year period immediately prior to the Expiration Date,
the Expiration Date shall automatically be extended until the third anniversary
of the effective date of the Company's initial public offering. If this warrant
has not been exercised prior to the Expiration Date, this warrant shall be
deemed to have been automatically exercised on the Expiration Date by "cashless"
conversion pursuant to Section 1.2.

      4.2 LEGENDS. This warrant and the Shares (and the securities issuable,
directly or indirectly, upon conversion of the Shares, if any) shall be
imprinted with a legend in substantially the following form:

THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED, AND MAY NOT BE SOLD, PLEDGED OR OTHERWISE TRANSFERRED WITHOUT AN
EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR PURSUANT TO RULE 144 OR AN
OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE CORPORATION AND ITS COUNSEL
THAT SUCH REGISTRATION IS NOT REQUIRED.

      4.3 COMPLIANCE WITH SECURITIES LAWS ON TRANSFER. This warrant and the
Shares issuable upon exercise of this warrant (and the securities issuable,
directly or indirectly, upon conversion of the Shares, if any) may not be
transferred or assigned in whole or in part without compliance with applicable
federal and state securities laws by the transferor and the transferee
(including, without limitation, the delivery of investment representation
letters and legal opinions reasonably satisfactory to the Company). The Company
shall not require Holder to provide an opinion of counsel if the transfer is to
an affiliate of Holder or if there is no material question as to the
availability of current information as referenced in Rule 144(c), Holder
represents that it has complied with Rule 144(d) and (e) in reasonable detail,
the selling broker represents that it has complied with Rule 144(f), and the
Company is provided with a copy of Holder's notice of proposed sale.

      4.4 TRANSFER PROCEDURE. Subject to the provisions of Section 4.3, Holder
may transfer all or part of this warrant or the Shares issuable upon exercise of
this warrant (or the securities issuable, directly or indirectly, upon
conversion of the Shares, if any) by giving the Company notice of the portion of
the warrant being transferred setting forth the name, address and taxpayer
identification number of the transferee and surrendering this warrant to the
Company for reissuance to the transferee(s) (and Holder, if applicable);
provided, however, that Holder may transfer all or part of this warrant to its
affiliates, including, without limitation, Comerica Incorporated, at any time
without notice to the Company, and such affiliate shall then be entitled to all
the rights of Holder under this warrant and any related agreements, and the
Company shall cooperate fully in ensuring that any stock issued upon exercise of
this warrant is issued in the name of the affiliate that exercises the warrant.
The terms and conditions of this

                                       5.
<PAGE>

warrant shall inure to the benefit of, and be binding upon, the Company and the
holders hereof and their respective permitted successors and assigns. Unless the
Company is filing financial information with the SEC pursuant to the Securities
Exchange Act of 1934, the Company shall have the right to refuse to transfer any
portion of this warrant to any person who directly competes with the Company.

      4.5 NOTICES. All notices and other communications from the Company to the
Holder, or vice versa, shall be deemed delivered and effective when given
personally or mailed by first-class registered or certified mail, postage
prepaid, at such address as may have been furnished to the Company or the
Holder, as the case may be, in writing by the Company or such Holder from time
to time. All notices to the Holder shall be addressed as follows:

                           Comerica Bank - California
                           Attn: Warrant Administrator
                           Technology and Life Sciences Division
                           P.O. Box 7279
                           San Francisco, CA 94120-7279

      4.6 AMENDMENTS. This warrant and any term hereof may be changed, waived,
discharged or terminated only by an instrument in writing signed by the party
against which enforcement of such change, waiver, discharge or termination is
sought.

      4.7 ATTORNEYS' FEES. In the event of any dispute between the parties
concerning the terms and provisions of this warrant, the party prevailing in
such despute shall be entitled to collect from the other party all costs
incurred in such dispute, including reasonable attorneys' fees.

      4.8 GOVERNING LAW. This warrant shall be governed by and construed in
accordance with the laws of the State of Delaware, without giving effect to its
principles regarding conflicts of law.

                                      VOCUS, INC.

                                      By:    /s/ Stephen Vintz
                                             ---------------------------------

                                      Name:  Stephen Vintz

                                      Title: CFO

                                      By:    _________________________________

                                      Name:  _________________________________

                                      Title: _________________________________

                                       6.
<PAGE>

                                   APPENDIX 1

                               NOTICE OF EXERCISE

      1. The undersigned hereby elects to purchase __________ shares of the
___________ stock of Vocus, Inc. pursuant to the terms of the attached warrant,
and tenders herewith payment of the purchase price of such shares in full.

      2. Please issue a certificate or certificates representing said shares in
the name of the undersigned or in such other name as is specified below:

                  Comerica Bank - California
                  Attn: Warrant Administrator
                  Technology and Life Sciences Division
                  P.O. Box 7279
                  San Francisco, CA 94120-7279

      3. The undersigned represents it is acquiring the shares solely for its
own account and not as a nominee for any other party and not with a view toward
the resale or distribution thereof except in compliance with applicable
securities laws.

COMERICA BANK - CALIFORNIA or
Registered Assignee

_____________________________
(Signature)

_____________________________
(Date)

                                       1.
<PAGE>

                                    EXHIBIT A

                            COMERICA BANK-CALIFORNIA
                            ANTI-DILUTION AGREEMENT
                           (FOR COMMON STOCK WARRANTS)

      This Anti-dilution Agreement is entered into as of November 19, 2002, by
and between Comerica Bank - California ("Purchaser") and Vocus, Inc. ("the
Company").

                                    RECITALS

      A. Concurrently with the execution of this Anti-dilution Agreement, the
Purchaser is purchasing from the Company a Warrant to Purchase Stock (the
"Warrant") pursuant to which Purchaser has the right to acquire from the Company
the Shares (as defined in the Warrant).

      B. By this Anti-dilution Agreement, the Purchaser and the Company desire
to set forth the adjustment in the number of Shares issuable upon exercise of
the Warrant as a result of a Diluting Issuance (as defined below).

      C. Capitalized terms used herein shall have the same meaning as set forth
in the Warrant.

      NOW, THEREFORE, in consideration of the mutual promises, covenants and
conditions hereinafter set forth, the parties hereto mutually agree as follows:

      1. DEFINITIONS. As used in this Anti-dilution Agreement, the following
terms have the following respective meanings:

            (a) "Option" means any right, option or warrant to subscribe for,
purchase or otherwise acquire common stock or Convertible Securities.

            (b) "Convertible Securities" means any evidences of indebtedness,
shares of stock or other securities directly or indirectly convertible into or
exchangeable for common stock.

            (c) "Issue" means to grant, issue, sell, assume or fix a record date
for determining persons entitled to receive any security (including Options),
whichever of the foregoing is the first to occur.

            (d) "Additional Common Shares" means all common stock (including
reissued shares) Issued (or deemed to be issued pursuant to Section 2) after the
date of the Warrant. Additional Common Shares does not include, however, any
common stock Issued in a transaction described in Sections 2.1 and 2.2 of the
Warrant; any common stock Issued upon conversion of preferred stock outstanding
on the date of the Warrant; the Shares; or common stock Issued as incentive or
in a nonfinancing transaction to employees, officers, directors or consultants
to the Company.

                                       1.
<PAGE>

      2. DEEMED ISSUANCE OF ADDITIONAL COMMON SHARES. The shares of common stock
ultimately Issuable upon exercise of an Option (including the shares of common
stock ultimately Issuable upon conversion or exercise of a Convertible Security
Issuable pursuant to an Option) are deemed to be Issued when the Option is
Issued. The shares of common stock ultimately Issuable upon conversion or
exercise of a Convertible Security (other than a Convertible Security Issued
pursuant to an Option) shall be deemed Issued upon Issuance of the Convertible
Security. The maximum amount of common stock Issuable is determined without
regard to any future adjustments permitted under the instrument creating the
Options or Convertible Securities.

      3. ADJUSTMENT OF WARRANT PRICE FOR DILUTING ISSUANCES.

            3.1 WEIGHTED AVERAGE ADJUSTMENT. If the Company issues Additional
Common Shares after the date of the Warrant and the consideration per Additional
Common Share (determined pursuant to Section 9) is less than the Warrant Price
in effect immediately before such Issue (a "Diluting Issuance"), the Warrant
Price in effect immediately before such Issue shall be reduced, concurrently
with such Issue, to a price (calculated to the nearest hundredth of a cent)
determined by multiplying the Warrant Price by a fraction:

                  (a) the numerator of which is the amount of common stock
outstanding immediately before such Issue plus the amount of common stock that
the aggregate consideration received by Company for the Additional Common Shares
would purchase at the Warrant Price in effect immediately before such Issue, and

                  (b) the denominator of which is the amount of common stock
outstanding immediately before such Issue plus the number of such Additional
Common Shares.

            3.2 ADJUSTMENT OF NUMBER OF SHARES. Upon each adjustment of the
Warrant Price, the number of Shares Issuable upon exercise of the Warrant shall
be increased to equal the quotient obtained by dividing (a) the product
resulting from multiplying (i) the number of Shares Issuable upon exercise of
the Warrant and (ii) the Warrant Price, in each case as in effect immediately
before such adjustment, by (b) the adjusted Warrant Price.

            3.3 SECURITIES DEEMED OUTSTANDING. For the purpose of this Section
3, all securities Issuable upon exercise of any outstanding Convertible
Securities or Options, Warrants, or other rights to acquire securities of the
Company shall be deemed to be outstanding.

      4. NO ADJUSTMENT FOR ISSUANCES FOLLOWING DEEMED ISSUANCES. No adjustment
to the Warrant Price shall be made upon the exercise of Options or conversion of
Convertible Securities.

      5. ADJUSTMENT FOLLOWING CHANGES IN TERMS OF OPTIONS OR CONVERTIBLE
SECURITIES. If the consideration payable to, or the amount of common stock
Issuable by, the Company increases or decreases, respectively, pursuant to the
terms of any outstanding Options or Convertible Securities, the Warrant Price
shall be recomputed to reflect such increase or decrease. The recomputation
shall be made as of the time of the Issuance of the Options or Convertible
Securities. Any changes in the Warrant Price that occurred after such Issuance
because other Additional Common Shares were Issued or deemed Issued shall also
be recomputed.

                                       2.
<PAGE>

      6. RECOMPUTATION UPON EXPIRATION OF OPTIONS OR CONVERTIBLE SECURITIES. The
Warrant Price computed upon the original Issue of any Options or Convertible
Securities, and any subsequent adjustments based thereon, shall be recomputed
when any Options or rights of conversion under Convertible Securities expire
without having been exercised. In the case of Convertible Securities or Options
for common stock, the Warrant Price shall be recomputed as if the only
Additional Common Shares Issued were the shares of common stock actually Issued
upon the exercise of such securities, if any, and as if the only consideration
received therefor was the consideration actually received upon the Issue,
exercise or conversion of the Options or Convertible Securities. In the case of
Options for Convertible Securities, the Warrant Price shall be recomputed as if
the only Convertible Securities Issued were the Convertible Securities actually
Issued upon the exercise thereof, if any, and as if the only consideration
received therefor was the consideration actually received by the Company
(determined pursuant to Section 9), if any, upon the Issue of the Options for
the Convertible Securities.

      7. LIMIT ON READJUSTMENTS. No readjustment of the Warrant Price pursuant
to Sections 5 or 6 shall increase the Warrant Price more than the amount of any
decrease made in respect of the Issue of any Options or Convertible Securities.

      8. 30 DAY OPTIONS. In the case of any Options that expire by their terms
not more than 30 days after the date of Issue thereof, no adjustment of the
Warrant Price shall be made until the expiration or exercise of all such
Options.

      9. COMPUTATION OF CONSIDERATION. The consideration received by the Company
for the Issue of any Additional Common Shares shall be computed as follows:

            (a) CASH shall be valued at the amount of cash received by the
Corporation, excluding amounts paid or payable for accrued interest or accrued
dividends.

            (b) PROPERTY. Property, other than cash, shall be computed at the
fair market value thereof at the time of the Issue as determined in good faith
by the Board of Directors of the Company.

            (c) MIXED CONSIDERATION. The consideration for Additional Common
Shares Issued together with other property of the Company for consideration that
covers both shall be determined in good faith by the Board of Directors.

            (d) OPTIONS AND CONVERTIBLE SECURITIES. The consideration per
Additional Common Share for Options and Convertible Securities shall be
determined by dividing:

                  (i) the total amount, if any, received or receivable by the
Company for the Issue of the Options or Convertible Securities, plus the minimum
amount of additional consideration (as set forth in the instruments relating
thereto, without regard to any provision contained therein for a subsequent
adjustment of such consideration) payable to the Company upon exercise of the
Options or conversion of the Convertible Securities, by

                  (ii) the maximum amount of common stock (as set forth in the
instruments relating thereto, without regard to any provision contained therein
for a subsequent

                                       3.
<PAGE>

adjustment of such number) ultimately Issuable upon the exercise of such Options
or the conversion of such Convertible Securities.

      10. GENERAL.

            10.1 GOVERNING LAW. This Anti-dilution Agreement shall be governed
in all respects by the laws of the State of Delaware as such laws are applied to
agreements between Delaware residents entered into and to be performed entirely
within Delaware.

            10.2 SUCCESSORS AND ASSIGNS. Except as otherwise expressly provided
herein, the provisions hereof shall inure to the benefit of, and be binding
upon, the successors, assigns, heirs, executors and administrators of the
parties hereto.

            10.3 ENTIRE AGREEMENT. Except as set forth below, this Anti-dilution
Agreement and the other documents delivered pursuant hereto constitute the full
and entire understanding and agreement between the parties with regard to the
subjects hereof and thereof.

            10.4 NOTICES, ETC. All notices and other communications required or
permitted hereunder shall be in writing and shall be mailed by first class mail,
postage prepaid, certified or registered mail, return receipt requested,
addressed (a) if to Purchaser at Purchaser's address as set forth below, or at
such other address as Purchaser shall have furnished to the Company in writing,
or (b) if to the Company, at the Company's address set forth below, or at such
other address as the Company shall have furnished to the Purchaser in writing.

            10.5 SEVERABILITY. In case any provision of this Anti-dilution
Agreement shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions of this Anti-dilution Agreement shall
not in any way be affected or impaired thereby.

            10.6 TITLES AND SUBTITLES. The titles of the sections and
subsections of this Agreement are for convenience of reference only and are not
to be considered in construing this Anti-dilution Agreement.

                                       4.
<PAGE>

            10.7 COUNTERPARTS. This Anti-dilution Agreement may be executed in
any number of counterparts, each of which shall be an original, but all of which
together shall constitute one instrument.

PURCHASER                                  ISSUER

COMERICA BANK - CALIFORNIA                 VOCUS, INC.

By:      /s/ Peter Gibson                  By:      /s/ Stephen Vintz
         -----------------------------              ----------------------------

Name:    Peter Gibson                      Name:    Stephen Vintz
Title:   V.P.                              Title:   CFO

Address: 11921 Freedom Dr.                 Address: 4296 Forbes Blvd.
         Reston, VA 20190                           Lanham, MD 20706

                                       5.
<PAGE>

                                    EXHIBIT B

                               REGISTRATION RIGHTS

      The Shares (if common stock), or the common stock issuable upon conversion
of the Shares, shall be deemed "registrable shares" or otherwise entitled to
full assignment and registration rights consistent with those of the holders of
the Company's Series B Preferred Stock shareholders in accordance with the terms
of the following agreement (the "Agreement") between the Company and its
investor(s):

                  Amended and Restated Registration Rights Agreement dated as of
                  June 18, 2001, by and among Vocus, Inc. and the Investors
                  named therein.

      The Company agrees that no amendments will be made to the Agreement, which
would have an adverse impact on Holder's registration rights thereunder without
the consent of Holder. By acceptance of the Warrant to which this Exhibit B is
attached, Holder shall be deemed to be a party to the Agreement (solely for
purposes of providing Holder with the same assignment and registration rights as
are provided to the Company's Series B Preferred stockholders under Sections 3
and 4 of the Agreement).

                                       1.

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