Obama has only 3-point national lead on McCain (Reuters/C-SPAN/Zogby poll)

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There is sign the race is closer, as it usually takes several days after a debate to register its effect.

NASHVILLE, Tennessee (Reuters) - Democrat Barack Obama has a narrow 3-point lead in the U.S. presidential race on Republican John McCain less than a month before the election, according to a Reuters/C-SPAN/Zogby poll released on Tuesday. Obama leads McCain among likely U.S. voters 48 percent to 45 percent in the national poll, which has a margin of error of 2.8 percentage points. Four percent of voters said they were still undecided.