WASHINGTON/DEL RAY BEACH, Florida (Reuters) - Facing a cliffhanger re-election attempt, President Barack Obama will launch a round-the-clock, two-day campaign blitz through six battleground states next week to try to fend off the challenge from Republican Mitt Romney. Polls show Obama's strong debate performance this week gained him little or no ground against the former Massachusetts governor with just over two weeks until the November 6 election. ...

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