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On that letter and the need for it. shannon bream thank you. jenna: a new national poll showing mitt romney pulling ahead of rick santorum in his home state of pennsylvania. earlier this week santorum was predicting a big win in pennsylvania, even as calls increase for him to get out of the race after romneys latest primary sweep. chief political correspondent carl cameron is live in washington with more on all of this. how do you see pennsylvania right now. >> reporter: there is one poll that s...