WASHINGTON (AP) -- Barack Obama needs to remind voters why they loved him in 2008. Mitt Romney needs for voters to get to know and like him better.With polls showing the presidential race so close, each candidate wants badly to host a flawless political convention in the next two weeks to gain the upper hand for the campaign's fall homestretch.These splashy conventions are intended to rally the thousands of core Republican supporters who will flock to Tampa, Fla., next week and the Democratic loyalists who will descend on Charlotte, N.C., the following week. But such gatherings also...

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