NEW YORK (Reuters) - Locked in a tense race with time running out, President Barack Obama and Republican challenger Mitt Romney took time off to exchange light-hearted jabs and make fun of each other on Thursday in a joint appearance at a high-profile charity dinner. Two days after a brutal debate in which they exchanged verbal blows and stalked each other on stage, Obama and Romney greeted each other warmly, dressed formally in white tie and tails. But the combativeness of the campaign trail was ever-present as the two foes gave back-to-back speeches at the 67th annual Alfred E. ...

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