U.S. servicemen line up to board a bus as they begin their journey home at Al Asad Air Base west of Baghdad, Iraq, on Nov. 1. The U.S. has promised to withdraw from Iraq by the end of the year as required by a 2008 security agreement between Washington and Baghdad. Some 39,000 U.S. troops are scheduled to clear out along with their equipment. Khalid Mohammed/AP hide caption

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Keith Olbermann left MSNBC's Countdown with Keith Olbermann last January. Craig Blankenhorn/AP hide caption

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This video frame grab provided by the Mitt Romney presidential campaign shows a scene from an ad called "Believe in America" that is running in New Hampshire. Romney Presidential Campaign/AP hide caption

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Republican presidential candidate Herman Cain addresses the media on Tuesday in Arizona. Cain said he would not drop his bid for the Republicans' presidential nomination in the face of decade-old allegations of inappropriate sexual behavior. Matt York/AP hide caption

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