Last night, veteran Democratic pollster Peter Hart conducted a focus group featuring 12 undecided, ticket-splitting voters in Colorado, which illustrated the tough challenge President Obama faces in winning a second term. He's lost significant ground among these swing voters: Ten of the participants voted for Obama in 2008; only three of them said they leaned towards re-electing him in 2012. In an initial survey taking leaners into account, Mitt Romney led Obama 5-3, with four completely undecided.

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