Kelly AyotteRepublican presidential candidate and former Massachusetts Governor Mitt Romney (L) shares a laugh with U.S. Senator Kelly Ayotte (R-NH) during a campaign stop at Pinkerton Academy in Derry, New Hampshire January 7, 2012.Republican presidential candidate and former Massachusetts Governor Mitt Romney (L) shares a laugh with U.S. Senator Kelly Ayotte (R-NH) during a campaign stop at Pinkerton Academy in Derry, New Hampshire January 7, 2012.REUTERS/Brian SnyderJeb BushFormer Florida Governor Jeb Bush speaks during a conference on education at Intercontinental hotel in Tegucigalpa August 22, 2011.Former Florida Governor Jeb Bush speaks during a conference on education at Intercontinental hotel in Tegucigalpa August 22, 2011.REUTERS/Edgard GarridoChris ChristieNew Jersey Governor Chris Christie endorses Republican presidential candidate and former Massachusetts Governor Mitt Romney in Lebanon, New Hampshire October 11, 2011.New Jersey Governor Chris Christie endorses Republican presidential candidate and former Massachusetts Governor Mitt Romney in Lebanon, New Hampshire October 11, 2011.REUTERS/Adam HungerMitch DanielsIndiana Governor Mitch Daniels speaks at the Conservative Political Action conference (CPAC) dinner in Washington February 11, 2011.Indiana Governor Mitch Daniels speaks at the Conservative Political Action conference (CPAC) dinner in Washington February 11, 2011.REUTERS/Jonathan ErnstBobby JindalGovernor Bobby Jindal (R-LA) speaks during the Republican Leadership Conference in New Orleans, Louisiana June 17, 2011.Governor Bobby Jindal (R-LA) speaks during the Republican Leadership Conference in New Orleans, Louisiana June 17, 2011.REUTERS/Sean GardnerBob McDonnellU.S. Republican presidential candidate and former Massachusetts Governor Mitt Romney (L) applauds his endorsement from Virginia Governor Bob McDonnell during a campaign rally in North Charleston, South Carolina, January 20, 2012.U.S. Republican presidential candidate and former Massachusetts Governor Mitt Romney (L) applauds his endorsement from Virginia Governor Bob McDonnell during a campaign rally in North Charleston, South Carolina, January 20, 2012.REUTERS/Jim YoungTim PawlentyRepublican presidential candidate and former Massachusetts Governor Mitt Romney (L) and former Minnesota Governor Tim Pawlenty wait backstage at the Rochester Opera House in Rochester, New Hampshire January 8, 2012.Republican presidential candidate and former Massachusetts Governor Mitt Romney (L) and former Minnesota Governor Tim Pawlenty wait backstage at the Rochester Opera House in Rochester, New Hampshire January 8, 2012.REUTERS/Brian SnyderRob PortmanU.S. Republican presidential candidate and former Massachusetts Governor Mitt Romney and Senator Rob Portman (R-OH) call potential voters from his campaign headquarters in Charleston, South Carolina, January 19, 2012.U.S. Republican presidential candidate and former Massachusetts Governor Mitt Romney and Senator Rob Portman (R-OH) call potential voters from his campaign headquarters in Charleston, South Carolina, January 19, 2012.REUTERS/Jim YoungCondoleezza RiceFormer U.S. Secretary of State Condoleezza Rice speaks to supporters of the Jewish Primary Day School of the Nation's Capital in Washington, in this handout image from May 3, 2009 at the 6th and I Historic Synagogue. An allergic reaction caused the swelliFormer U.S. Secretary of State Condoleezza Rice speaks to supporters of the Jewish Primary Day School of the Nation's Capital in Washington, in this handout image from May 3, 2009 at the 6th and I Historic Synagogue. An allergic reaction caused the swelling to Rice's right eye. Picture taken May 3, 2009.REUTERS/Ron Sachs/HandoutMarco RubioU.S. Republican Senate candidate Marco Rubio (L) stands with his wife Jeanette (R) and their children R-L: Daniella, Amanda, Anthony and Dominic during his victory speech at a rally in Coral Gables, Florida, November 2, 2010.U.S. Republican Senate candidate Marco Rubio (L) stands with his wife Jeanette (R) and their children R-L: Daniella, Amanda, Anthony and Dominic during his victory speech at a rally in Coral Gables, Florida, November 2, 2010.REUTERS/Hans DerykPaul RyanHouse Budget Chairman Paul Ryan (L) (R-WI) introduces U.S. Republican presidential candidate Mitt Romney (R) as he addresses supporters at Lawrence University during a campaign stop in Appleton, Wisconsin, March 30, 2012.House Budget Chairman Paul Ryan (L) (R-WI) introduces U.S. Republican presidential candidate Mitt Romney (R) as he addresses supporters at Lawrence University during a campaign stop in Appleton, Wisconsin, March 30, 2012.REUTERS/Darren HauckBrian SandovalBrian Sandoval, governor of Nevada, gives opening remarks during the SkyBridge Alternatives (SALT) Conference in Las Vegas, Nevada May 11, 2011.Brian Sandoval, governor of Nevada, gives opening remarks during the SkyBridge Alternatives (SALT) Conference in Las Vegas, Nevada May 11, 2011.REUTERS/Steve MarcusNikki HaleyMitt Romney presents a birthday cake to South Carolina Governor Nikki Haley during a campaign rally in North Charleston, South Carolina.Mitt Romney presents a birthday cake to South Carolina Governor Nikki Haley during a campaign rally in North Charleston, South Carolina.REUTERS/Jim YoungJohn ThuneSen. John Thune of South Dakota, 51, walks to his office after meeting with Minority Leader Mitch McConnell at the Capitol in Washington, December 21, 2010.Sen. John Thune of South Dakota, 51, walks to his office after meeting with Minority Leader Mitch McConnell at the Capitol in Washington, December 21, 2010.REUTERS/Jonathan Ernst
