Obama will probably win independents, they're pretty Dem-leaning in Colorado.
The poll is D+4 (40/36/24) when the Early Vote is R+2 (35/37/28).
Romney has a +1 advantage in the R/D crossover (12 Ds voting R vs 11 Rs voting D).
And R self-identification is -1.4 (36 vs. 37.4) from the Early Vote totals compiled by the Colorado SoS.
I guess the only conclusion is that in addition to a lot of self-identifying Is as D in the poll, there will be a lot more Democrats than Republicans voting on Election Day. Otherwise this poll does not match the early vote data.
As you will recall from yesterday, the 2010 exit polls for CO were D+5.