Caucus

 Jan. 2, 2012 - West Des Moines, Iowa, U.S. - Republican presidential candidate Michele Bachmann tours businesses in West Des Moines on Monday. (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)

 Jan. 1, 2012 - Council Bluffs, Iowa, U.S. - Republican presidential candidate Mitt Romney speaks at Bayliss Park Hall in Council Bluffs, Iowa on Sunday, January 1, 2012. Romney visited Council Bluffs, Iowa on Sunday concluding his public appearances for the day .(Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)

  Jan. 2, 2012 - Perry, Iowa, U.S - Republican presidential candidate Rick Perry speaks during a campaign rally at Hotel Pattee (Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)

 January 2, 2012. - Des Moines, Iowa, U.S. - Republican presidential candidate Ron Paul speaks during his ''Whistle-Stop'' tour at the Downtown Des Moines Marriott Hotel. (Credit Image: © Andrew A. Nelles/ZUMA Press)

 Jan. 1, 2012 - Atlantic, Iowa, U.S. - Republican presidential candidate Mitt Romney exits after speaking at the Family Table Restaurant in Atlantic, Iowa on Sunday, January 1, 2012. Republican presidential candidate Mitt Romney spoke to a large crowd of supporters and journalists during a campaign stop at the Family Table Restaurant in Atlantic on Sunday.(Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)

Jan. 1, 2012 - Atlantic, Iowa, U.S. - Republican presidential candidate Mitt Romney speaks at the Family Table Restaurant in Atlantic, Iowa on Sunday. Republican presidential candidate Mitt Romney spoke to a large crowd of supporters and journalists during a campaign stop at the Family Table Restaurant in Atlantic on Sunday.(Credit Image: © Andrew A. Nelles/ZUMAPRESS.com)