Three new polls underscore why Team Obama has reason to be concerned about their standing in the Rust Belt. An EPIC/MRA poll of Michigan registered voters released last week shows Romney leading Obama, 46 to 45 percent, with only 41 percent viewing the president favorably. In Pennsylvania, a newly-released Quinnipiac poll shows Obama with a 46 percent job-approval rating-in the danger zone for a sitting president-and leading Romney 46 percent to 40 percent. And in Wisconsin, exit polls conducted for the gubernatorial race showed Obama with a 51 percent to 45 percent lead, too close for comfort in a must-win blue-wall state.