Sen. Mark Udall (D-CO) holds a four-point lead in the closely watched Colorado Senate race, according to a Denver Post poll released on Thursday.
The poll found Udall leading Rep. Cory Gardner (R-CO), his Republican challenger, 46 percent to 42 percent. The margin of error is 3.9 points.
A NBC/Marist poll released Sept. 7 had Udall up six points. A CBS/New York Times/YouGob poll from Sept. 7 showed the incumbent Democrat with a three-point lead.
TPM’s PollTracker average gives Udall a two-point advantage.
The Post poll, conducted by pollster SurveyUSA from Sept. 8 to 10, surveyed 664 likely Colorado voters.