Romney had gained ground in Colorado over the past month, moving from a five-point deficit in mid-September to a tie, with each candidate drawing 48% support among likely voters.
In Nevada, the President outpolledRomney among likely voters, 50% to 47%, a lead within the survey's margin of error of plus or minus three percentage points. In a late-September Journal survey, the President had led by about the same margin, 49% to 47%.
"Right now, Colorado is a coin toss, and the [Obama] edge in Nevada is slight," said Lee Miringoff, director of the Marist Institute for Public Opinion, which conducted the polls.
Neither state is among the largest battlegrounds, but they are drawing increasing attention in light of the close nature of the battle in Ohio, the second-largest swing state. Should either candidate lose Ohio, winning in Colorado and Nevada would become crucial to his efforts to make up the lost votes.
Nearly all scenarios require Mr. Romney to carry Florida, the nation's largest swing state, in order to build an Electoral College majority; that isn't true of Mr. Obama, who has several ways to assemble a majority without Florida.Polls show Obama ahead in Florida 49% to 47%.