NASHVILLE, Tenn., Oct 8 (Reuters) - Democrat Barack Obama has a slender 2-point lead over Republican John McCain in a tight U.S. presidential race, according to a Reuters/C-SPAN/Zogby poll released on Wednesday.

Obama led McCain by 47 percent to 45 percent among likely U.S. voters in the daily national poll, a statistically insignificant lead within the margin of error of 2.8 percentage points. Obama had led by 3 points in the poll released on Tuesday.

Four percent of voters said they were still undecided. (Editing by Patricia Wilson and Mohammad Zargham)

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