(CNN) - It was a crucial swing state that Barack Obama carried in both of his presidential election victories, but a new poll suggests that if Hillary Clinton's the Democratic nominee in 2016, she may have a challenge winning Colorado.
And a Quinnipiac University survey released Thursday also indicates that the George Washington Bridge controversy has hurt New Jersey Gov. Chris Christie's standing with voters in the Centennial State.
According to the poll, the former Secretary of State's at 43% and Christie at 42% among registered voters in Colorado, in a hypothetical 2016 general election matchup in the race for the state's nine electoral votes.
The Garden State Governor held a 46%-38% lead over Clinton in Quinnipiac's November survey, soon after Christie's landslide re-election and before the bridge controversy landed in the national headlines. And the percentage of Coloradans who say Christie would make a good president dropped from 48% in November to 36% now.
In other potential 2016 showdowns with other possible GOP White House contenders, Rep. Paul Ryan of Wisconsin, the 2012 GOP vice presidential nominee, holds a 48%-43% margin over Clinton, while Sen. Rand Paul of Kentucky edges out Clinton 47%-43%. In another hypothetical matchup, Clinton's at 44% and Sen. Ted Cruz of Texas stands at 43%.
"Coloradans love affair with New Jersey Gov. Christopher Christie takes an icy February turn while former Secretary of State Hillary Clinton seems frozen in place, in the run-up to the 2016 presidential race," said Tim Malloy, assistant director of the Quinnipiac University Polling Institute.
Competitive 2014 Senate race
Colorado Sen. Mark Udall, who could face a challenging re-election this year, has a 45%-41% approval/disapproval rating in the poll, with Colorado voters split at 42% on whether he deserves re-election. The first term Democratic Senator holds single digit advantages over five possible GOP challengers in hypothetical November 2014 matchups.
The Quinnipiac University poll was conducted Jan. 29 – Feb. 2, with 1,139 Colorado voters questioned by telephone. The survey's overall sampling error is plus or minus 2.9 percentage points.