Politico reports:
Cory Gardner is ahead by 6 points in a Quinnipiac University poll out Thursday, the latest in a string of surveys that show the Colorado Republican Senate candidate in the lead.
Gardner leads Democratic Sen. Mark Udall, 47 percent to 41 percent, among likely voters, the poll shows.
A CNN/Opinion Research Center survey, in the field during the same time period and released on Wednesday, put Gardner up 4 points, 50 percent to 46 percent.
