Polls in recent days have shown things moving back toward Obama, but the president’s late afternoon rain-soaked rally here was part of a stepped-up effort in the state. Obama and his super PAC allies have been trying to match Romney on the state’s airwaves and the campaign has been using volunteer reinforcements from next door in Minnesota and Illinois for phone banks, door-to-door canvassing and other get-out-the-vote efforts. And while this was Obama’s first trip to the state in months, Vice President Joe Biden has been on the ground here twice in recent weeks.

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