Rep. Michele Bachmann, R-Minn., announces an end to her campaign for president on Wednesday in Des Moines, Iowa. Chris Carlson/AP hide caption

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Minnesota Rep. Michele Bachmann, joined by husband Marcus (left) and family and friends, announces that she will end her campaign for president in West Des Moines on Wednesday. Chris Carlson/AP hide caption

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Texas Gov. Rick Perry speaks at a campaign event at Clark Electric Co-op on Dec. 27 in Osceola, Iowa. Perry's stance on immigration has troubled some Iowa voters. Justin Sullivan/Getty Images hide caption

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In a last bout of campaigning before Christmas, Rep. Michele Bachmann of Minnesota signs autographs at the National Motorcycle Museum in Anamosa, Iowa, on Dec. 22. Charlie Riedel/AP hide caption

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Republican presidential candidate former House Speaker Newt Gingrich speaks during a Republican presidential debate in Sioux City, Iowa, Thursday, Dec. 15, 2011. Eric Gay/AP hide caption

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Republican presidential candidates jockeyed for airtime when they met for their first prime time TV debate on Saturday night in South Carolina. Alex Wong/Getty Images hide caption

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