COLUMBUS, Ohio -- Barack Obama may have few advantages in his tight presidential race with Mitt Romney, given that the national unemployment rate hovers above 8 percent and a majority of voters are not bullish on the country's direction. He does, however, have one benefit his opponent lacks: incumbency. Obama tried to capitalize on that fact Monday when he visited this critical swing state, announcing that his administration has filed a complaint with the World Trade Organization against China’s auto-export subsidies.Republicans have portrayed Obama as...

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