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Republican presidential candidate, Texas Gov. Rick Perry speaks at the Iowa State Fair in Des Moines, Iowa, Monday, Aug. 15, 2011. (AP Photo/Charles Dharapak)

Rick Perry

Party: Republican
Republican presidential candidate former Utah Gov. Jon Huntsman makes a statement during a debate, Thursday, Sept. 22, 2011, in Orlando, Fla. (AP Photo/Phelan M. Ebenhack, Pool)

Jon Huntsman

Party: Republican
Republican presidential candidate former Rep. Newt Gingrich, speaks during the American Principles Project Palmetto Freedom Forum Monday, Sept. 5, 2011, in Columbia, S.C. (AP Photo/ Mary Ann Chastain)

Newt Gingrich

Party: Republican
FILE - In this April 2, 2011, file photo, former Massachusetts Gov. Mitt Romney speaks at the Republican Jewish Coalition annual leadership meeting in Las Vegas. On Monday, Romney announced his presidential bid, saying it's time to restore America greatness. (AP Photo/Julie Jacobson, File)

Mitt Romney

Party: Republican
Republican presidential candidate Rick Santorum delivers remarks in a Faith and Freedom Coalition Rally at the Rosen Centre Hotel in Orlando, Florida, Thursday, September 22, 2011. The candidates spoke individually at the event before their appearance at a GOP debate. (Joe Burbank/Orlando Sentinel/MCT)

Rick Santorum

Party: Republican
Rep. Michele Bachmann

Michele Bachmann

Party: Republican
U.S. Rep. Ron Paul, of Texas, and GOP presidential candidate, speaks to a crowd during a town hall meeting Tuesday, Sept. 27, 2011 at the Northeast Iowa Community College east campus in Dubuque, Iowa. (AP Photo/Telegraph Herald, Jessica Reilly)

Ron Paul

Party: Republican