John Frank --- The Denver Post
One of the nation's most-watched U.S. Senate races is headed for a photo finish, as the final Denver Post poll in the 2014 election shows Democratic U.S. Sen. Mark Udall and Republican rival Cory Gardner are essentially tied.
A poll conducted this week shows Gardner at 46 percent and Udall at 44 percent — a narrow edge within the four-percentage-point margin-of-error. The poll surveyed those who are likely to vote and those who returned ballots in Colorado's first all-mail election.
Another 5 percent support a third-party candidate and 5 percent remain undecided, according to the SurveyUSA poll conducted Monday through Wednesday.
A breakdown of the final poll numbers offers promise to Republicans and Democrats.
For Gardner's camp, the poll shows a slightly larger three-point lead among those who said they already voted, a reflection of early Republican energy surrounding the election.
A look at the demographics in the poll shows Gardner holds a lead among voters aged 35 to 49 as well as seniors. He also leads self-identified independent voters by seven points, a key indicator in the state where one-third of the voters are registered as unaffiliated.