Things aren't looking good for Rick Santorum. Mitt Romney's campaign moved to Pennsylvania on Wednesday, and a poll already shows him leading Santorum in his home state by five percentage points. The survey, by Public Policy Polling, has Romney getting 42 percent of the vote to Santorum's 37 percent. That's a huge shift from a month ago, when Romney polled at 25 percent and Santorum at 43 percent. Santorum's campaign has called the Pennsylvania primary, which is three weeks away, a must-win.
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