Full Episode Summary
Four days before the Iowa Caucuses, Mitt Romney and Ron Paul lead, but Rick Santorum may surprise come voting day. Plus, how will Congressional retirements affect Democrats' efforts to retain control of the Senate in 2012? Joining Gwen from Iowa: Karen Tumulty, The Washington Post; Jeff Zeleny, The New York Times. Around the table: Christina Bellatoni, CQ Roll Call; Susan Davis, USA Today.