(CNN) – Less than a week before Election Day, Colorado's heated Senate race remains a virtual dead heat, according to a new poll.
Democrats, however, may be pulling away in the race for governor - a contest in which Republicans once had high hopes.
Full results (pdf)
Forty-seven percent of likely voters in the latest CNN/Time/Opinion Research Corporation survey now back Republican Senate nominee Ken Buck while 46 percent support incumbent Democrat Michael Bennet.
Seven percent are either backing someone else or offered no opinion.
Buck's one-point edge is well within the poll's sampling error.
One defining feature of the Senate race: the gender gap. Buck now leads Bennet by 12 points - 51 to 39 percent - among men, while Bennet holds a 12-point advantage - 54 to 42 percent - among women.
Also of note: the geographic divide.
"As frequently happens in Colorado politics, the race for the Senate will be decided in the Denver suburbs," said CNN Polling Director Keating Holland.
"Bennet has a two-to-one lead in Denver and Boulder counties, with Buck holding a sizeable lead in Eastern and Western Colorado and along the northern and southern parts of the Front Range.
But in the four-county area immediately surrounding Denver, the race is essentially tied, with Bennet holding an edge in older suburbs and Buck piling up big margins in exurban communities."
Bennet appears to be picking up ground; he trailed Buck by five points among likely voters in a September 17-21 CNN/Time/ORC poll.
While the candidates are virtually tied among likely voters, Bennet leads by five points, 49 to 44 percent, among the larger pool of registered voters.
Buck, the Weld County district attorney, was once a long shot in the battle for the GOP nomination, but thanks in part to support from some in the Tea Party movement, he defeated former Lt. Gov Jane Norton, who was recruited to run by national Republicans and was the early favorite in the race.
Bennet survived a spirited Democratic primary challenge from former Colorado House Speaker Andrew Romanoff. He was appointed early last year to replace Democratic Sen. Ken Salazar, who stepped down to serve as Interior Secretary in the Obama administration.
In the race for governor, 51 percent of likely voters now support Denver Mayor John Hickenlooper, the Democratic nominee. Thirty-seven percent support former congressman and 2008 GOP presidential candidate Tom Tancredo, who is running as the American Constitution Party's candidate.
Only 10 percent now back Republican nominee Dan Maes, who has been backed a number of Tea Party activists but struggled in the wake of a series of crippling campaign controversies.
National Republicans appear to have washed their hands of the race.
The CNN/Time/Opinion Research Corporation poll was conducted October 20-26, with 1,356 registered voters in Colorado, including 829 likely voters questioned by telephone. The survey's sampling error is plus or minus 2.5 percentage points for registered voters and 3.5 percentage points for likely voters.
– CNN's Alan Silverleib contributed to this report