Mitt Romney and Rick Santorum mixed it up over their records on the debt, taxes and earmarks Wednesday night in the first Republican presidential debate in almost a month, and the first before three contests in the next 10 days followed by the Super Tuesday primaries and caucuses on March 6. Answering a question from the audience on how to bring down the nation's debt, the former Massachusetts governor attacked Santorum's record when he was representing Pennsylvania in the Senate.