The prospect and potential for severe weather or other natural disasters on or immediately before election day, in addition to lingering hypotheticals about terrorist attacks in the United States, have brought attention to the possibility of postponing as well as the authority to postpone, cancel, or reschedule an election for federal office.
There is no provision in the United States Constitution which currently authorizes in express language any federal official or institution to "postpone" an election for federal office. The Constitution expressly delegates to the states the primary authority to administer within their respective jurisdictions elections for federal office, with a residual and superseding authority within the United States Congress over most aspects of congressional elections (other than the place of choosing Senators). Additionally, the Constitution provides an express authority in Congress over at least the timing of the selections of presidential electors in the states. As to the time established for holding federal elections under these express constitutional authorities, Congress has legislated, originally in 1845, a uniform date for presidential electors to be chosen in the states, and in 1872, a uniform date for congressional elections across the country.
In addition to the absence of specific constitutional direction, there is also no federal law which currently provides express authority to "postpone" an election, although the potential operation of federal statutes regarding vacancies and the consequences of a state's failure to select on the prescribed election day may allow the states to hold subsequent elections in "exigent" circumstances. A handful of states have provided in s tate law express authority to postpone or reschedule elections within their jurisdictions based on certain emergency contingencies, and others have provided general emergency provisions which might be applicable to election situations.
As to potential disruptions on or immediately before election day, particularly in regard to the presidential election, some of the confused scenarios and proposed solutions appear to stem from a misconception of the presidential election as being in the nature of a national referendum. The presidential election is, however, in essence a series of state (and District of Columbia) elections for presidential electors from that state (or jurisdiction) that the Congress has mandated, since 1845, to be held on the same day throughout the country. An event which may disrupt an election for presidential electors in one state, or in a part of one state, may not affect or impact at all the election for presidential electors in other states, or in other portions of the affected state. 
Consistent with the states' authority over the administration and procedural aspects of elections to federal office within their jurisdictions is their initial responsibility for resolving issues of challenges and recounts in those elections. This authority and these procedures may be relevant in the case of disruptions, disasters, or violence at the polling places on election day which could conceivably cast into question the efficacy and legitimacy of a particular election result in that jurisdiction. The relevant state procedures could be applied after the fact of an election to resolve initial questions concerning the results of such elections.
It should be emphasized that while the states have the initial authority, or the "first cut" at resolving disputes and recounts in their respective jurisdictions regarding elections to federal office, the Constitution expressly provides that the final authority over the elections and returns of its own Members lies exclusively in each house of Congress. As to the elections for presidential electors, the Constitution expressly gives to the Congress the task of counting the electoral votes for President. Implicit within this explicit authority to count the electoral votes has been the practical necessity to determine which electoral votes to count. While Congress has established procedures and rules for counting the electoral votes and resolving disputed lists of electors, Congress has, by statute, specifically given the states a "safe harbor" time within which to formally resolve presidential electoral disputes, prior to the meeting of the Electoral College in December, which then would be considered "conclusive" upon the Congress in counting those electoral votes for President.

	Timing of Federal Elections

The United States Constitution does not require a uniform election date in the states for elections to the House or Senate, or for the selection of presidential electors. Rather, this has been done by Congress by the enactment of federal law. 
The Constitution, while declaring in the "Times, Places and Manner" clause (art. I, §4, cl. 1) that the states have the general authority over the administration of even federal elections within their respective jurisdictions, expressly provides that the Congress may supersede a state provision regarding, among other things, the timing of congressional elections, and further provides that Congress may establish the time for the election of presidential electors in the states (art. II, §1, cl. 4). Under these express constitutional authorities, Congress has established uniform dates for the general elections to federal office within the states, which now are mandated to be held on the first Tuesday next following the first Monday in November in the appropriate even-numbered years.
It was not until 1845 that a uniform date for electing presidential electors in the states was mandated by Congress. Previous to that congressional enactment, the timing for selecting presidential electors could, and did, vary from state to state. Congress in 1844 and 1845 was, however, concerned about the allegations of fraud and corruption in the previous election (1840) for electors for President and Vice President in several states. It was asserted that some of the particular misconduct in that election appeared to have been encouraged, in part, because the states had differing dates for the presidential election, which allowed the alleged movement of populations and voters to key states having later elections (described as "pipelaying"). Congress sought to eliminate such opportunities for fraud and corruption by establishing a uniform day throughout the country for selecting the electors for President and Vice President, while assuring that those states that required an absolute majority to elect could continue to hold a run-off for presidential electors if needed in an election on a subsequent date.
The uniform date for congressional elections in the states was not established by the Congress until 1872. In first enacting this legislation, the Congress appeared to be concerned primarily with two factors, that is, the potential undue and unfair influence on elections in some states that earlier results and elections in other states may routinely have; and the burden on voters who in some states would have to go to the polls twice for two different general elections to choose federal officers in presidential election years.

	Federal Authority to Postpone

As noted, the United States Constitution does not provide express authority for any federal official or institution to postpone an election for federal office in a particular state, in any part of one state, or in all of the states. Specifically, there is no current constitutional authority residing in the President of the United States, nor the executive branch of government, to postpone, cancel, or reschedule elections for federal office in the various states. There might certainly be some potential emergency powers inherent in the President of the United States, as well as those delegated by statute, but there is no precedent for such powers being applied with respect to elections held in the various states for presidential electors, authority over which, as to the procedures and methods, has been expressly delegated in the Constitution to the states. It is possible that some scenarios could be imagined, however, where attacks, disruptions, and destruction are so severe and so dangerous in certain localities, particularly in crowded urban areas, that the President under a rule of necessity may look to protect the public safety by federalizing the state national guard and restricting movement and activities in such areas which would obviously affect the ability to conduct an election at those sites.
Unlike the President, Congress does have explicit constitutional authority over elections to federal office which is of an express, residual nature concerning congressional elections, and a broad implicit authority recognized by the Supreme Court to legislate to protect the integrity and proceedings of presidential elections (as well as express authority over the date of the selection of presidential electors). Congress could, therefore, pass legislation regarding dates, and emergency postponements and/or rescheduling times for elections to federal offices. The courts have recognized an expansive authority in the Congress to "provide a complete code" for federal elections within the states, including presidential elections and, within the parameters of the specific dates for the length and terms of federal offices established within the Constitution, Congress would appear to have the authority to exercise its legislative discretion with regard to emergency scheduling and rescheduling. As noted by the Supreme Court in the 19 th century with regard to Congress's authority over the conduct of elections for federal office in the states:
That a government whose essential character is republican, whose executive head and legislative body are both elective ... , has no power by appropriate laws to secure this election from the influence of violence ... is a proposition so startling as to arrest attention and demand the gravest consideration.
If this government is anything more than a mere aggregation of delegated agents of other States and governments, each of which is superior to the general government, it must have the power to protect the elections on which its existence depends from violence and corruption .
Furthermore, in theory, Congress could also enact a law delegating to the executive certain authority in this area regarding emergency rescheduling. However, as a policy matter, and under the constitutional authority delegated to it, Congress has traditionally allowed the states, within the framework of the federal constitutional and statutory mandates, to exercise the substantive control over the procedures and administrative details of elections within their own respective jurisdictions. 
It should be noted, and as discussed in more detail in the following sections, that there are existing provisions under current federal law regarding a failure of a state to make a selection on the prescribed election day with respect to both congressional elections (2 U.S.C. §8) and presidential elections (3 U.S.C. §2), which have traditionally left the details of such decisions up to the states.

	State Authority Over Election Procedures and Administration of Federal Elections

		State Authority Under United States Constitution

There is under our federal system of shared sovereignty a division of jurisdiction and authority which occurs in the case of elections to federal office under the provisions of the United States Constitution. In the first instance, the terms of federal offices and the qualifications of candidates eligible for federal offices are established and fixed by the agreement of the states within the instrument which created those offices, that is, the U.S. Constitution. The length of the terms of federal offices, as well as the qualifications for such offices, are thus unalterable by the Congress alone, or by any state unilaterally.
The Constitution expressly provides, however, that the individual states have the authority to administer elections for federal congressional office, while providing that Congress may generally supersede any such regulations. The Supreme Court has described this "Times, Places and Manner" clause of Article I, Section 4, as a "default provision; it invests the States with responsibility for the mechanics of congressional elections ... but only so far as Congress declines to pre-empt state legislative choices." The state legislatures also have express authority over the "manner" in which presidential electors in their state are to be chosen. Within certain constitutionally prescribed parameters, the states are also responsible to establish the qualifications for voting in their states in federal elections. 
Finally, as to its own Members, the Constitution provides that each house of Congress expressly retains the authority to be the final judge of the results of their elections, and to judge those qualifications of their Members expressly prescribed the Constitution. Congress, in joint session, is also assigned in the Constitution the duty to count the electoral votes for President and to declare the winner.
Although Congress has a "residual and superseding" authority over congressional elections (and could, in theory, pass a detailed code for administering federal elections), Congress has generally allowed the states the primary responsibility to administer elections to federal office (and the states, in turn, have further devolved immediate administrative and supervisory control over many election procedures to local and county authorities within their jurisdictions). This policy of deferring to the states in the administration of all elections within their respective borders, including federal elections, has generally recognized the principle that because of the varying political cultures, practices, and traditions across the nation, and from state-to-state, that operational authority over most of the election mechanics is more efficiently left to the states and localities.
Under the states' "Times, Places and Manner" authority in the Constitution, the states may promulgate a broad range of regulatory and administrative provisions over the mechanics and procedures even for federal elections within their states regarding such things as forms of the ballots, "ballot access" by candidates (including new party or independent candidates), voting procedures, voting places, and the nominating and electoral process generally, to facilitate proper election administration generally, and to prevent election fraud, voter confusion, ballot overcrowding, and the proliferation of frivolous candidates, specifically.
The states' procedural and administrative authority over elections within their jurisdictions, including elections to federal office, includes the initial authority over election contests, protests, and recounts. As noted by the Supreme Court in Roudebush v. Hartke , even though the Constitution expressly gives each house of Congress the final authority over the elections and returns of its own members (Article I, Section 5), a state may adopt contest and recount provisions as one of the "safeguards which experience shows are necessary in order to enforce the fundamental right involved." The Court noted there:
Indiana has found, along with many other States, that one procedure necessary to guard against irregularity and error in the tabulation of votes is the availability of a recount. ... A recount is an integral part of the Indiana electoral process and is in the ambit of the broad powers delegated to the States by Art. I, § 4.
It is true that a State's verification of the accuracy of election results pursuant to its Art. I, § 4, powers is not totally separable from the Senate's power to judge elections and returns. But a recount can be said to "usurp" the Senate's function only if it frustrates the Senate's ability to make an independent final judgment. A recount does not prevent the Senate from independently evaluating the election any more than the initial count does. The Senate is free to accept or reject the apparent winner in either count, and, if it chooses, to conduct its own recount.
As to the presidential election, as noted, the state legislatures are granted express authority in the Constitution over the "manner" in which presidential electors are to be chosen. Although there remains some controversy over the Supreme Court's ruling in Bush v. Gore , where a federal court intervened to stop a state-ordered recount of the vote for presidential electors in Florida in 2000, the Court's per curium opinion left intact and affirmed, at least in theory, a state legislature's authority under the United States Constitution to enact protest or contest statutes and provisions regarding elections for presidential electors (although the implementation of that procedure as directed by the Florida courts was found by a majority of the Supreme Court to violate the equal protection and due process requirements of the United States Constitution). The primacy under the United States Constitution of the state legislatures in establishing the mechanisms for appointment of presidential electors and in fashioning recount and protest statutes was also emphasized by the Supreme Court in the decision preceding Bush v. Gore , that is, Bush v. Palm Beach County Canvassing Board, which had remanded to the Florida state courts the issue of the recount proceedings in the Florida presidential election of 2000. Under such authority, the state may be in the position to initially hear challenges to and to rectify voting problems or issues that arose in a presidential election because of disruptions in voting caused by natural or man-made disasters. 

		Authority Under State Law to Postpone or Reschedule an Election to Federal Office

There are several state provisions which currently purport to give to certain specified state officials the authority to "postpone" or to reschedule an election within the state, prior to the holding of an election, for a number of emergency and exigent circumstances. Furthermore, other states may have general emergency powers which might be used, and might be broad enough, to allow the Governor or other state executive official to take action which may involve a postponement of an election. Because of the increased awareness of the threat from severe weather events, or from concern over hypothetical terrorist threats, state legislatures may in the future consider the adoption of additional provisions which set out the considerations and circumstances for the declaration of a postponement and/or rescheduling of an election within their jurisdiction, including elections to federal offices.

			Conformance With Federal Law

Does a state law or order instituting a rescheduling of an election to federal office within that state, or a portion of the state, impermissibly affect the date of such election in contravention of the federal laws that have established election day for federal offices to be the first Tuesday after the first Monday in November?

				Congressional Elections

The statutorily established date for elections for federal office—while it is clearly mandatory and not merely advisory—may not necessarily be an "absolute" such that no election subsequent to that date could be or should be recognized. In fact, as noted, the federal statutory scheme for congressional elections specifically provides for the contingency of a "vacancy" in the state delegation, whether that vacancy is caused by death, resignation, or incapacity, or by a "failure to elect at the time prescribed by law," by authorizing another time for the election to be prescribed by state law:
2 U.S.C. § 8 . Vacancies 
The time for holding elections in any State, District, or Territory for a Representative or Delegate to fill a vacancy, whether such vacancy is caused by a failure to elect at the time prescribed by law, or by the death, resignation, or incapacity of a person elected, may be prescribed by the laws of the several States and Territories respectively.
The Supreme Court of the United States has found that the day established in 2 U.S.C. Section 7 for electing Senators and Representatives in the states is a mandatory date, and that a state's statutory scheme may not regularly permit or allow the "election" of such a federal official at an election held prior to the first Tuesday after the first Monday in November date. The Louisiana election provisions which designated as "elected" to Congress an open primary winner who received at least a majority of the votes cast in that primary election held prior to the general election, were therefore found to be a violation of the federal law setting the general election date. States that allow "early voting" in federal elections, however, have not been found by federal courts to be holding a prior election in violation of the federal statute, since it was found that the election would not be "consummated" before election day, or that such ballots would not be officially counted or tallied before federally prescribed election day.
Federal courts interpreting the federal statutes regarding the timing of elections to Congress have noted that a state's scheme for elections must be in general conformance with the date prescribed by federal law, at 2 U.S.C. Section 7, and may not routinely allow the election on an earlier date, but that certain "exigent" circumstances may permit the holding of an election for federal office at a subsequent time under 2 U.S.C. Section 8. The federal District Court in the District of Columbia in Busbee v. Smith , in a case affirmed by the United States Supreme Court, found that an exigent circumstance, such as the State of Georgia's reapportionment plan being refused preclearance by the Justice Department under the Voting Rights Act of 1965 because of "discriminatory effects," allowed for an election to federal office in two congressional districts to be held on a subsequent date:
...[W]here exigent circumstances arising prior to or on the date established by [2 U.S.C.] section 7 preclude holding an election on that date, a state may postpone the election until the earliest practicable date. In this case, for example, Georgia will "fail[ ] to elect at the time prescribed by law" because its purposefully discriminatory conduct prevented it from securing Section 5 approval for constitutionally required changes in its voting procedures. As a result, we believe, that [2 U.S.C.] section 8 permits a reasonable postponement of the elections in the Fourth and Fifth Congressional Districts.
This reasoning, as noted later by another federal court, would allow for the postponement of an election, and the holding of the election for federal office in the state at a later date, for a number of possible "exigent" circumstances, including "natural disasters" such as hurricanes, tied votes, or fraud. This federal court in Georgia found that the state's statutory requirement that a candidate—to be elected—receive a majority and not merely a plurality of votes in the general election, was such an exigent circumstance that could require the holding of a subsequent run-off election for Senator to be held on November 24, after the earlier November general election mandated by 2 U.S.C. Section 7 resulted in no candidate receiving a majority of the votes:
The court in Busbee acknowledged that 2 U.S.C. § 8 allows states, under certain circumstances, to hold elections at times other than those prescribed by 2 U.S.C. section 7. Id. at 524-25. In addition to the circumstances it specifically enumerates—death, resignation, personal incapacity—2 U.S.C. section 8 allows states to reschedule elections "where exigent circumstances arising prior to or on the date established by section 7 preclude holding an election on that date." Id. at 525. The court offered natural disasters, and the parties to the instant suit offer fraud and a tie vote as examples of 'exigent' circumstances warranting state rescheduling.

				Elections for Presidential Electors

The election for presidential electors presents somewhat different issues from those elections for congressional office because the language of the federal statutes for presidential electors varies from the language governing congressional elections. The statute concerning the timing and scheduling for congressional elections provides expressly that when there is a vacancy caused by death, resignation or incapacity, or when "such vacancy is caused by a failure to elect at the time prescribed by law," then a subsequent election may be scheduled. This language appears to be broad enough and, as noted above, has been interpreted by federal courts to actually permit a temporary postponement and rescheduling of a congressional election. The federal statute for presidential elections, however, expressly states that "[w]henever any State has held an election for the purpose of choosing electors," but fails to "make a choice on the day prescribed by law," then the electors may be selected on a subsequent day in the manner established by the legislature of the state:
3 U.S.C. § 2 . Failure to make choice on prescribed day
Whenever any State has held an election for the purpose of choosing electors, and has failed to make a choice on the day prescribed by law, the electors may be appointed on a subsequent day in such a manner as the legislature of such State may direct.
Does the wording of 3 U.S.C. Section 2 mean that the authority of the states to reschedule an election for presidential electors is contingent upon the state actually having "held an election for the purpose of choosing electors"? If so, then under this theory no prior postponement and rescheduling would be permitted state-wide, even a postponement for natural disasters such as an impending hurricane, or the destruction shortly prior to the elections of a number of polling places, since it would conflict with the federally scheduled time in 3 U.S.C. Section 2.
Certainly, the states could respond after-the-fact to disruptions on election day. If a regularly scheduled election is disrupted by natural or man-made disasters in a state, then the state could, under its general election contest and challenge procedures, find that the results of the election were not viable or valid. Pursuant to such finding, the state might order a new election or a continuation of the election in the affected areas (whereby those people who were not certified by election officials as having already voted could come to vote at a subsequent time), which would appear to be in conformance with federal law, both at 2 U.S.C. Section 8 (for congressional elections), as well as 3 U.S.C. Section 2, in the case of the election of presidential electors. In such cases, the state had clearly "held an election," but a choice was not necessarily made because the state has determined that the results could not fairly be ascertained on the prescribed election day.
However, if there is a disruption prior to an election, or anticipated at the time of election—such as in the case of a hurricane, for example—could an election for presidential electors not be held on the proscribed date, that is, be postponed and rescheduled in a particular state and still be in conformance with 3 U.S.C. Section 2? There is no clear and definitive authority on this question, nor do there appear to be specific legal precedents bearing upon this issue. Even though the purpose in 1845 of this particular provision at 3 U.S.C. Section 2, regarding the subsequent choosing of electors, was clearly to allow those states that required an absolute "majority" in a general election to be "elected" to hold a subsequent run-off election if no candidate's electors received such a majority, the language itself may be open to broader interpretation.
It may be contended in the first place that the express constitutional authority of the state legislatures over the selection of presidential electors at Article II, Section 1, clause 2, which language allows the state legislatures to enact statutory schemes to protect the validity of their elections for presidential electors in the state, including fashioning protest or contest procedures, may be consonant with such an authority in the legislature itself to temporarily postpone or to authorize by state law the postponement and rescheduling of state-wide elections by the state executive in certain emergency circumstances. One of the major points made by the Supreme Court in both the earlier Palm Beach County case, and the latter Bush v. Gore decision, was the primacy of the state legislatures' role in the manner of the selection of presidential electors. Although clearly the concepts of "time" and "manner" of election are not necessarily synonymous, this constitutional provision and the Supreme Court's deference to the state legislatures may arguably give credibility to states' attempts to statutorily prescribe a system whereby emergency procedures may be implemented with respect to all state-wide elections, including the general election for presidential electors, which provide that such elections, while certainly scheduled for the federally prescribed date, because of such emergency and exigent circumstances need to be rescheduled, postponed, or continued at a subsequent time.
Furthermore, it may be noted that in addition to Article II, Section 1, clause 2 of the Constitution, the federal law at 3 U.S.C. Section 5 (which was part of the original Electoral Vote Count Act of 1887), provides the state legislatures with further statutory authority to finally and conclusively resolve within the state protests, challenges, and contests of the election of presidential electors. One of the purposes of the original 1887 statute regarding counting of the electoral votes was to substantially devolve upon the states the burden for resolving conflicts over the election, selection, and appointment of those states' own electors for President and Vice President. As noted by the Supreme Court, this statute at 3 U.S.C. Section 5:
creates a "safe harbor" for a State insofar as congressional consideration of its electoral votes are concerned. If the state legislature has provided for final determination of contests or controversies by a law made prior to election day, that determination shall be conclusive if made at least six days prior to said time of meeting of the electors.
Clearly, there is an understanding that the states were intended to have the principal and initial responsibility for resolving the conflicts, arguments, controversies and difficulties involved in the processes of selecting presidential electors in their respective states. If a challenge were raised to a state's selection of presidential electors because of a partial or complete postponement and rescheduling of the popular vote for presidential electors due to "exigent" circumstances, and such challenge was resolved in the state within the "safe harbor" timeframe, then the presumption would appear to exist that such determination would be "conclusive" on the Congress in accepting those electoral votes.
It is possible to argue, therefore, that to harmonize the provisions for elections to federal office, that is specifically the provisions for subsequent congressional elections at 2 U.S.C. Section 8 and the presidential provisions at 3 U.S.C. Section 2, and the authority devolved upon the states in 3 U.S.C. Section 5, that it would be logical to read the federal statutes as permitting a postponement and an election on a subsequent date for both Congress and presidential electors under the state's current laws when necessitated by emergency and exigent circumstances in the particular state. As long as the election and any subsequent challenges are resolved in time, such resolution would be "conclusive" on Congress in counting the presidential electoral votes. Such a supposition might be bolstered somewhat by the alternative, that is, that the federal law could work to disenfranchise the voters of a particular state when that state believes it is necessary to temporarily postpone entirely or partially the regularly scheduled state-wide elections because of some extraordinary and disastrous event in the state.
Finally, although both the authority and practical arguments would appear to provide support for placing the power for postponement of elections for federal offices within the particular states, there has been some concerns expressed, as a matter of policy as well as statutory interpretation, over allowing any state to postpone or otherwise reschedule an election for federal office within the entire state—particularly an election for presidential electors—based merely on the anticipation of events that may or may not happen, or on an event taking place in another state or in only one part of the same state. The grounds for any such postponement or rescheduling, as well as any express, implied, or inherent authority, would have to be examined initially under the applicable state law and procedure, and no blanket statement could be made with respect to the interpretation in all of the states.
There appears to be little legal or factual precedent to apply to such circumstances regarding an election in a state, particularly for presidential electors. Remembering that the presidential election is not necessarily in the nature of a national referendum, but is rather 51 simultaneous state/district elections for presidential electors, however, it may be asked as a matter of policy whether or not an event that occurred earlier in the state, or an event that occurs in a different state or in a different voting locality within the same state, would or should be enough to trigger a postponement of an election in the entirety of any particular state as a matter of good public policy. It has been argued that a violent disruption of an election in Manhattan, New York City, should not necessarily affect, or at least could not predictably affect, an election in Manhattan, Kansas. It may be noted that on the fateful day of September 11, 2001, despite the events unfolding in Manhattan in New York City, in Pennsylvania, and at the Pentagon in the Washington, DC, area, a primary election for federal congressional office—a contested congressional primary—on the South Shore of Massachusetts reportedly drew a larger than normal number of the voting age population. Similarly, a violent tropical storm hit Hawaii a day before a contested Senate primary election in the summer of 2014, and the executive authority of the state decided to proceed with the primary election in all of the state other than two precincts which were particularly devastated by Tropical Storm Iselle on August 8, 2014. The Chief Election Officer in the state of Hawaii decided to allow the election to continue and be held in those two precincts the next week, on August 15, 2014.
Problems and disruptions in one state clearly may not predictably (or necessarily) affect the turnout or the viability of the results of an election in another state. Similarly, natural or man-made disasters occurring, or anticipated to occur, in one part or region of a state may not predictably affect the turnout in another part of the state. To avoid the appearance of political maneuvering or gamesmanship, and to adhere more closely to the federal statutory scheme for the timing of elections for presidential electors, it has been argued that the more reasoned policy would be—absent the most extreme disruption and immediate "exigent" circumstance—to have the state conduct such an election as scheduled in as many localities and local jurisdictions as feasible, and then to deal with any implications of the disruptions subsequently, after having held the election, including re-votes or rescheduled votes in affected areas, under the state's contest and challenge procedures.

	Appendix: Constitutional and Federal Statutory Provisions

Constitutional Provisions: Congressional Elections
A rticle I, Section 2 , clause 1 . The House of Representatives shall be composed of Members chosen every second year by the people of the several States ....
Article I, Section 2 , clause 4 . When vacancies happen in the Representation from any State, the Executive Authority thereof shall issue Writs of Election to fill such Vacancies.
Amendment Seventeen . The Senate of the United States shall be composed of two Senators from each State, elected by the people thereof, for six years ....
When vacancies happen in the representation of any State in the Senate, the executive authority of such State shall issue writs of election to fill such vacancies: Provided , That the legislature of any State may empower the executive thereof to make temporary appointments until the people fill the vacancies by election as the legislature may direct.
Article I, Section 4, clause 1 . The times, Places and Manner of holding Elections for Senators and Representatives, shall be prescribed in each State by the Legislature thereof; but the Congress may at any time by Law make or alter such Regulations, except as to the Places of chusing Senators.
Article I, Section 5, clause 1 . Each house shall be the Judge of the Elections, Returns and Qualifications of its own Members ....
Presidential Elections.
Article II, Section 1 , cl. 1. The executive Power shall be vested in a President of the United States of America. He shall hold his Office during the Term of four Years, and, together with the Vice President, chosen for the same Term, be elected, as follows:
Article II, Section 1, cl. 2. Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole number of Senators and Representatives to which the State may be entitled in the Congress.... 
Article II, Section 1, clause 4 . The Congress may determine the Time of chusing the Electors, and the Day on which they shall give their votes; which Day shall be the same throughout the United States.
Amendment XII . The Electors shall meet in their respective states, and vote by ballot for President and Vice-President, ... and they shall make distinct lists of all persons voted for as President, and of all persons voted for as Vice-President, and of the number of votes for each, which lists they shall sign and certify, and transmit sealed to the seat of the government of the United States, directed to the President of the Senate; – The President of the Senate shall, in the presence of the Senate and House of Representatives, open all the certificates and the votes shall then be counted ....
Dates of Federal Office Terms.
Amendment XX, Section 1 . The terms of the President and Vice President shall end at noon on the 20 th day of January, and the terms of Senators and Representatives at noon on the 3 rd day of January, of the years in which such terms would have ended if this article had not been ratified; and the terms of their successors shall then begin.
Current Federal Statutory Provisions.
2 U.S.C. Section 1 . Time for election of Senators . At the regular election held in any State next preceding the expiration of the term for which any Senator was elected to represent such State in Congress, at which election a Representative to Congress is regularly by law to be chosen, a United States Senator from said State shall be elected by the people thereof for the term commencing on the 3d day of January next thereafter.
2 U.S.C. Section 7 . Time of election . The Tuesday next after the 1 st Monday in November, in every even numbered year, is established as the day for the election, in each of the States and Territories of the United States, of Representatives and Delegates to the Congress commencing on the 3d day of January next thereafter. 
2 U.S.C. Section 8 . Vacancies . The time for holding elections in any State, District, or Territory for a Representative or Delegate to fill a vacancy, whether such vacancy is caused by a failure to elect at the time prescribed by law, or by the death, resignation, or incapacity of a person elected, may be prescribed by the laws of the several States and Territories respectively.
3 U.S.C. Section 1 . Time of appointing electors . The electors of President and Vice President shall be appointed, in each State, on the Tuesday next after the first Monday in November, in every fourth year succeeding every election of a President and Vice President.
3 U.S.C. Section 2 . Failure to make choice on prescribed day . Whenever any State has held an election for the purpose of choosing electors, and has failed to make a choice on the day prescribed by law, the electors may be appointed on a subsequent day in such a manner as the legislature of such State may direct.
3 U.S.C. Section 5 . Determination of controversy as to appointment of electors . If any State shall have provided, by laws enacted prior to the day fixed for the appointment of the electors, for its final determination of any controversy or contest concerning the appointment of all or any of the electors of such State, by judicial or other methods or procedures, and such determination shall have been made at least six days before the time fixed for the meeting of the electors, such determination made pursuant to such law so existing on said day, and made at least six days prior to said time of meeting of the electors, shall be conclusive, and shall govern in the counting of the electoral votes as provided in the Constitution, and as hereinafter regulated, so far as the ascertainment of the electors appointed by such State is concerned.

Summary:
The prospect and potential for severe weather or other natural disasters, in addition to lingering hypotheticals about terrorist attacks directed at certain metropolitan areas, have brought attention to the possibility of postponing and/or the authority to postpone, cancel, or reschedule an election for federal office.
The United States Constitution does not provide in express language current authority for any federal official or institution to "postpone" an election for federal office. Although the Constitution does expressly delegate to the states the primary authority to administer within their respective jurisdictions elections for federal office, there remains within the Constitution a residual and superseding authority in the U.S. Congress over most aspects of congressional elections (art. I, §5, cl. 1), and an express authority in Congress over at least the timing of the selections of presidential electors in the states (article II, §1, cl. 4). Under this authority Congress has legislated a uniform date for presidential electors to be chosen in the states, and a uniform date for congressional elections across the country, to be on the Tuesday immediately following the first Monday in November in the particular, applicable even-numbered election years.
In addition to the absence of an express constitutional direction, there is also no federal law which currently provides express authority to "postpone" an election, although the potential operation of federal statutes regarding vacancies and the consequences of a state's "failure to select" on the prescribed election day (see 2 U.S.C. §8, and 3 U.S.C. §2) might allow a state to hold subsequent elections in "exigent" circumstances. It would appear that under Congress's express constitutional authority over the timing of federal elections that Congress could, at some time, enact a federal law setting conditions, times, and dates for rescheduling of elections to federal offices in the states in emergency or other exigent circumstances, and with the proper standards and guidelines could delegate the execution and application of those provisions to executive branch or state officials.
With regard to state laws and federal elections, in addition to the general protest, contest, and challenge statutes whereby the results of elections to federal office are initially adjudicated in the states, a handful of states have provided in state law express authority to postpone or reschedule elections within their jurisdictions based on certain emergency contingencies. The states' authority within the United States Constitution appears to be sufficient to enact legislation to deal with emergency and exigent circumstances concerning federal elections, as long as such laws do not conflict with federal law enacted under Congress's superseding constitutional authority. Federal courts have thus generally interpreted federal law to permit the states to reschedule elections to congressional office when "exigent" circumstances have necessitated a postponement. There may be different issues raised in the case of the election of presidential electors if the state attempted to hold the entire election within the state on a different date, because the federal statute regarding the "failure to make a choice" on the prescribed election day for presidential electors is different than that regarding congressional elections.
This report has been revised from an earlier version and will be updated as case law or events warrant.