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Obama, though, enjoys lead among independent voters at 50 percent to 42.

The close findings in the ARG poll mirror those of other surveys, which show a similarly tight race. A Purple Strategies poll found Obama up 1 at 47-46. An NBC/Wall Street Journal/Marist poll last week showed the two candidates knotted at 48 percent each. A poll from Democratic Public Policy Polling (PPP), however, showed the president with a strong 4-point lead at 51-47.

Colorado is one of 12 battlegrounds won by Obama in 2008 that will likely determine the outcome of this year’s race.

Former President Bill ClintonBill ClintonTrump's favorability rating historically low, poll finds Dem boycotts of inauguration grow Dems 'outraged' with Comey after House briefing MORE will visit the state on Tuesday, attending rallies in Commerce City and Denver. Romney campaigned in the state last week, joined by his running mate Rep. Paul RyanPaul RyanHispanic Dems warn Latinos will be hit hard by ObamaCare repeal Schumer puts GOP on notice over ObamaCare repeal GOP must avoid Dems' mistakes when replacing ObamaCare MORE (R-Wis.).

The ARG poll was conducted from Oct. 25 to 28.