"Hickenlooper’s the most popular candidate for Governor, with a 51/41 approval rating. But his support has been stuck in the 47-48% range since before the primary. When Tancredo and Maes were splitting the vote relatively evenly it looked like that would be enough but as Maes’ support continues to dwindle to closer to zero Hickenlooper all the sudden looks extremely vulnerable," PPP said in a statement.

In a Magellan Data Mapping Strategies poll published last week, Hickenlooper leads Tancredo 44% to 43% to 9% for Dan Maes.

In Colorado's U.S. Senate race, Republican Ken Buck and Obama Democrat Michael Bennet are tied at 47% each, according to PPP. This is what SurveyUSA found in the Denver Post/ 9News poll.

Buck is winning independents 46% to 44% and is getting 84% of Republicans while Bennet is getting 92% of Democrats. There are more Republicans in the likely voter pool this year, PPP noted. 

"A worrisome sign for Bennet within the numbers is that 7% of Republicans are undecided while only 2% of Democrats are," PPP said, adding, "That could be an indication that Buck has more room to grow his support over the final week of the campaign."

LINK: Close races for governor and senator in Colorado, Public Policy Polling.