WASHINGTON (Reuters) - President Barack Obama and Republican challenger Mitt Romney are tied at 47 percent support each among likely voters with just over two weeks to go before the U.S. presidential election, a NBC/Wall Street Journal poll released on Sunday said. The nationwide poll, which was conducted after last Monday's presidential debate, reinforced the perception of the race as a cliffhanger. It showed "a little bit of a lead" for Romney among the critical "battleground" states as a group, NBC correspondent Chuck Todd said on the network's "Meet the Press" program. ...

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