Republican presidential candidate Texas Gov. Rick Perry.
Republican presidential candidate former Massachusetts Gov. Mitt Romney.
Senate Minority Leader Mitch McConnell of Ky., center, with Sen. John Barrasso, R-Wyo., left, and Senate Minority Whip Jon Kyl of Arizona, during a news conference Tuesday, Oct. 4, 2011.
NBC's Jamie Gangel reports that New Jersey Gov. Chris Christie has decided to not run for president in 2012.
New Jersey Gov. Chris Christie speaking in Paterson, N.J., Monday, Oct. 3, 2011.
U.S. Sen. Scott Brown, R-Mass., speaking to reporters at the Statehouse in Boston, Monday, Oct. 3, 2011.
Republican presidential candidate businessman Herman Cain in New York City, Monday, Oct. 3, 2011.