Rasmussen has Barack Obama moving to a six point lead in Colorado, seemingly solidifying a state that voted two times for George W. Bush, and one time for Bob Dole. From Rasmussen:

Barack Obama is pulling away from John McCain in Colorado, according to the latest Fox News/Rasmussen Reports telephone survey in the state.

Obama leads McCain by six points, 51% to 45%. A week ago, Obama had a one-point lead, and a week before that McCain was up by two.

Eighty-two percent (82%) of Colorado voters are now certain who they will vote for, up four points from a week ago. Eighteen percent (18%) say they may still change their minds, including one-third of unaffiliated voters in the state.

The trend is begining to harden, leaving McCain very little time and room to maneuver, as Obama continues to put more red states in play. That electoral map is getting smaller and smaller for John McCain.