DELRAY BEACH, Florida (Reuters) - U.S. President Barack Obama and Republican challenger Mitt Romney were tied in a dead heat on Sunday with 16 days to go until the election, increasing the stakes for their third and final debate. A NBC/Wall Street Journal poll had both Romney and Obama at 47 percent among likely voters, marking a comeback for the Republican since a series of missteps including the release of a secretly recorded video in which he suggested almost half of the electorate lives off government handouts. ...

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