Republican presidential candidate, former Massachusetts Gov. Mitt Romney, gets ready to march in the Fourth of July parade in Amherst, N.H., on July 4.
2 of 11
Rep. Michele Bachmann (R) of Minnesota officially announces her intent to seek the Republican presidential nomination in Waterloo, Iowa, on June 27.
3 of 11
Republican presidential candidate Herman Cain speaks during the 'Energy Independence Day Tea Party' rally on Independence Mall in Philadelphia on July 4.
4 of 11
Republican presidential candidate, Rep. Ron Paul (R) of Texas, smiles as he is greeted by area residents at the Village Store during a campaign stop in Freedom, N.H., on July 1.
5 of 11
Republican presidential hopeful and former Sen. Rick Santorum (R) of Pennsylvania shakes hands with guests during a campaign stop at a gathering for Mayor Ted Gatsis at St. George's Greek Orthodox Church in Manchester, N.H., on June 16.
6 of 11
Former New Mexico Gov. Gary Johnson announces his plans to seek the Republican nomination for president in front of the Statehouse in Concord, N.H., on April 21.
7 of 11
Republican presidential candidate, former House Speaker Newt Gingrich, greets people while walking in a Fourth of July parade in Clear Lake, Iowa, on July 4.
8 of 11
Republican presidential candidate and former Gov. Jon Huntsman of Utah shakes hands with Adam Goguen during a campaign stop with the Belknap County Republican Committee at JJ Goodwins in Center Barnstead, N.H., on July 3.
9 of 11
Rep. Thaddeus McCotter (R) of Michigan jams to a Chuck Berry tune on his star-spangled Fender Telecaster, much to the delight of his supporters. On Sept. 22, 2011 McCotter announced he was pulling out of the 2012 race, and throwing his support to Mitt Romney.
10 of 11
David J. Phillip/AP
In this Aug. 6 photo, Texas Gov. Rick Perry speaks in Houston. Gov. Perry announced his candidacy for president on Saturday, Aug. 13.