U.S. Presidential Candidate Obama Casts His Vote At Community Center In Chicago

President Barack Obama, second from the left, casts his vote, during early voting, in the 2012 election at the Martin Luther King Community Center, Thursday, Oct. 25, 2012, in Chicago. <AP Photo/Pablo Martinez Monsivais>

Republican presidential candidate, former Massachusetts Gov. Mitt Romney and wife Ann Romney vote in Belmont, Mass., Tuesday, Nov. 6, 2012. <AP Photo/Charles Dharapak>

Jenn Midcap and Jeff Igleheart cast their ballots while others wait in line at St. Jacobs Lutheran Church, Tuesday, Nov. 6, 2012, in North Canton, Ohio. <AP Photo/The Repository, Scott Heckel>

Voters stand in line at a Fort Myers, Fla. church late Tuesday, Nov. 6, 2012. After a grinding presidential campaign President Barack Obama and Republican presidential candidate, former Massachusetts Gov. Mitt Romney, yield center stage to American voters Tuesday for an Election Day choice that will frame the contours of government and the nation for years to come. <AP Photo/J Pat Carter>

Voters cast their votes at the Boys and Girls Club Tuesday on Election Day Tuesday, Nov. 6, 2012, in Charlottesville, Va. <AP Photo/The Daily Progress, Andrew Shurtleff>