Exhibit 10.4



                          , 2007 
 Capitol Acquisition Corp. 
 509
7th Street, N.W. 
 Washington, D.C. 20004 
 Citigroup Global Markets Inc. 
 388 Greenwich Street 
 New York, New York 10013 
  

	 	Re:	 	Initial Public Offering 

 Gentlemen: 
 This letter is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting
Agreement”) entered into by and between Capitol Acquisition Corp., a Delaware corporation (the “Company”), and Citigroup Global Markets Inc., as Representative (the “Representative”) of
the several Underwriters named in Schedule I thereto (the “Underwriters”), relating to an underwritten initial public offering (the “IPO”) of the Company’s units (the
“Units”), each comprised of one share of the Company’s common stock, par value $0.0001 per share (the “Common Stock”), and one warrant, each warrant exercisable for one share of Common Stock
(each, a “Warrant”). Certain capitalized terms used herein are defined in paragraph 11 hereof. 
 In order to induce
the Company and the Underwriters to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the benefit that such IPO will confer upon the undersigned as a stockholder of the Company, and for other good and valuable
consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees with the Company as follows: 
 1.
If the Company solicits approval of its stockholders of a Business Combination, the undersigned will (i) vote all shares of Founders’ Common Stock beneficially owned by him, her or it in accordance with the majority of the votes cast by
the holders of the IPO Shares and (ii) vote all other shares of the Company’s Common Stock that may be beneficially acquired by him, her or it in the IPO, any private placement or in the aftermarket in favor of such Business Combination.

  







 2. The undersigned hereby waives any and all right, title, interest or claim of any kind in or to any
distribution of the Trust Fund and any remaining net assets of the Company as a result of such liquidation with respect to his shares of Founders’ Common Stock (“Claim”) and hereby waives any Claim the undersigned may have in the
future as a result of, or arising out of, any contracts or agreements with the Company and will not seek recourse against the Trust Fund for any reason whatsoever. 
 3. The undersigned acknowledges and agrees that prior to entering into (i) a Business Combination with a target business that is, or has been within the past five years, affiliated with any of the Insiders or
special advisors of the Company or their affiliates, including an entity that is either a portfolio company, or has otherwise received a material financial investment from, any private equity fund or investment company (or an affiliate thereof) that
is affiliated with such individuals; or (ii) a Business Combination where the Company acquires less than 100% of a target business and any of the Insiders or special advisors of the Company or their affiliates acquire the remaining portion of
such target business; such transaction must be approved by a majority of the Company’s disinterested independent directors and the Company must obtain an opinion from an independent investment banking firm that such Business Combination is fair
to the Company’s unaffiliated stockholders from a financial point of view. 
 4. Neither the undersigned nor any affiliate of the
undersigned will be entitled to receive and will not accept any compensation or other cash payment for services rendered to the Company prior to or in connection with the consummation of the Business Combination; provided that the Company shall be
allowed to repay a non-interest bearing loan in an aggregate amount of $95,000 made to the Company by Leland Investments Inc. to cover the IPO expenses. The undersigned and any affiliate of the undersigned shall also be entitled to reimbursement
from the Company for their out-of-pocket expenses incurred in connection with identifying, investigating and consummating a Business Combination. 
 5. Neither the undersigned nor any affiliate of the undersigned will be entitled to receive or accept a finder’s fee or any other compensation in the event the undersigned or any affiliate of the undersigned originates a Business
Combination. 
 6. The undersigned will escrow all of its shares of Founders’ Common Stock until one year after the consummation by the
Company of a Business Combination subject to the terms of a Stock Escrow Agreement which the Company will enter into with the undersigned and an escrow agent acceptable to the Company. 
 7. The undersigned has full right and power, without violating any agreement by which it is bound, to enter into this letter agreement. 
 8. The undersigned hereby waives its right to exercise conversion 

  

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rights with respect to any shares of the Company’s common stock owned or to be owned by the undersigned, directly or indirectly, whether such shares be
part of the Founders’ Common Stock or shares purchased by the undersigned in the IPO or in the aftermarket, and agrees that he will not seek conversion with respect to such shares in connection with any vote to approve a Business Combination.

 9. The undersigned hereby agrees to not propose, or vote in favor of, an amendment to Article Sixth and Seventh of the Company’s
Certificate of Incorporation prior to the consummation of a Business Combination other than an amendment to Article Sixth of the Company’s Certificate of Incorporation in accordance with such Article Sixth thereof. Should such a proposal be put
before stockholders, the undersigned hereby agrees to vote against such proposal. This paragraph may not be modified or amended under any circumstances. 
 10. This letter agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving effect to conflicts of law principles that would result in the application
of the substantive laws of another jurisdiction. The undersigned hereby (i) agrees that any action, proceeding or claim against him arising out of or relating in any way to this letter agreement (a “Proceeding”) shall be brought and
enforced in the courts of the State of New York of the United States of America for the Southern District of New York, and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive, (ii) waives any objection to such
exclusive jurisdiction and that such courts represent an inconvenient forum and (iii) irrevocably agrees to appoint Graubard Miller as agent for the service of process in the State of New York to receive, for the undersigned and on his behalf,
service of process in any Proceeding. If for any reason such agent is unable to act as such, the undersigned will promptly notify the Company and Citigroup and appoint a substitute agent acceptable to each of the Company and Citigroup within 30 days
and nothing in this letter will affect the right of either party to serve process in any other manner permitted by law. 
 11. As used
herein, (i) a “Business Combination” shall mean a merger, capital stock exchange, asset acquisition or other similar business combination with an operating business; (ii) “Insiders” shall mean all officers, directors
and stockholders of the Company immediately prior to the IPO; (iii) “Founders’ Common Stock” shall mean all of the shares of Common Stock of the Company acquired by an Insider prior to the IPO; (iv) “IPO Shares”
shall mean the shares of Common Stock issued in the Company’s IPO; (v) “Sponsors’ Warrants” shall mean the warrants that are being sold privately by the Company simultaneously with the consummation of the IPO; and
(vi) “Trust Fund” shall mean the trust fund into which a portion of the net proceeds of the Company’s IPO will be deposited. 
 12. The undersigned acknowledges and understands that the Underwriters and the Company will rely upon the agreements, representations and warranties set forth herein in proceeding with the IPO. Nothing contained herein shall be 

  

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deemed to render the Underwriters a representative of, or a fiduciary with respect to, the Company, its stockholders or any creditor or vendor of the Company
with respect to the subject matter hereof. 
 13. This letter agreement shall be binding on the undersigned and such person’s respective
successors, heirs, personal representatives and assigns. This letter agreement shall terminate on the earlier of (i) the consummation of a Business Combination and (ii) the liquidation of the Company; provided, that such termination
shall not relieve the undersigned from liability from any breach of this agreement prior to its termination. 
  

	
	Capitol Acquisition Management LLC
	Print Name of Insider
	
	 
	Signature


  

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