The post-Labor Day, post-conventions polls show President Barack Obama leading Mitt Romney in the three key swing states of Florida, Ohio and Virginia, which ratchets up pressure on Romney to turn things around in the debates in October. Obama is ahead of Romney by five points among likely voters, 49 percent to 44 percent, in both Florida and Virginia, and in Ohio, he has a seven-point lead, 50 percent to 43 percent, according to new NBC News/Wall Street Journal/Marist polls. “You’d rather be in Obama’s shoes than Romney’s in these three critical states,” said Lee Miringoff, director of the Marist...