The poll was conducted this week after the third and final presidential debate.
It also showed President Obama has a slight edge in Nevada, another important swing state, where Obama leads Romney, 50 to 47 percent, among likely voters.
The polls were conducted Oct. 23 to 24. The Nevada poll has a margin of error of +/- 3 percent among likely voters. The Colorado poll has a margin of error of +/- 2.9 percent.
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