A new poll of the Colorado Senate race from CNN has Republican challenger Cory Gardner leading sitting Democrat Mark Udall by 4 points. Gardner is earning 50 percent support from Colorado likely voters, his highest rating yet, with Udall earning 46 percent support.

According to the Real Clear Politics average of polls, Gardner, a two-term House member, has a two-point lead, and has led in 7 of the last 8 polls of the race.