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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 seeks to stop lawsuit from ‘Apprentice’ contestant Trump asks why Clintons' ties to Russia aren't under investigation Playing hot potato and musical chairs with healthcare 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 RyanTHE MEMO: Frustrated Trump looks to turn it around Insurers face big choice on staying in ObamaCare Republicans seek to lower odds of a shutdown MORE (R-Wis.).

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