(CNN) - Call it the Rocky Mountain battle for the White House.
A new CNN Poll of Polls in Colorado suggests the battle for the state's 9 electoral votes is a dead heat. In the survey, compiled Sunday, 47 percent of likely voters in Colorado back Barack Obama for president, with 46 percent supporting John McCain. Seven percent of those questioned are undecided.
The CNN Poll of Polls is a compilation of the latest surveys in the state. The polls in this latest average are a Mason-Dixon survey conducted September 29-October 1, a CNN/Time/Opinion Research Corporation poll taken September 21-23, and an American Research Group survey conducted September 23-25.
Both campaigns are spending a lot of time and money campaigning in Colorado. McCain made a swing through the state on Thursday and Friday. Obama last campaigned in Colorado on September 29. The Democrats also held their party's national convention there in late August.
Colorado, New Mexico, and Nevada are three mountain west states that voted for George W. Bush in 2004 that the Democrats are hoping to turn from red to blue come Election Day.