In August of this year, a Quinnipiac poll found that Colorado senator Mark Udall's approval rating was +13 (47 percent approved of his job performance and 34 percent disapproved). But a new Quinnipiac poll out today shows that Udall's positive approval rating has evaporated, and just as many Colorado voters approve of Udall as those who disapprove (with 44 percent in each camp).

In hypothetical matchups, two different Republican contenders trail Udall by just three points. Ken Buck, a district attorney who lost the 2010 Senate race to incumbent Democrat Michael Bennet, trails Udall 45 percent to 42 percent. Businessman Jamie McMillan trails Udall 43 percent to 40 percent.

The same poll shows Hillary Clinton trailing three different Republicans (Chris Christie, and Rand Paul, Paul Ryan) in 2016 presidential matchups:

In an early look at the 2016 race for the White House, New Jersey Republican Gov. Christopher Christie tops former Secretary of State Hillary Clinton 46 - 38 percent in Colorado, according to a Quinnipiac University poll released today.

This compares to results of an August 23 survey by the independent Quinnipiac (KWIN- uh-pe-ack) University, showing Gov. Christie with 43 percent and Secretary Clinton at 42 percent, a tie.

In today's survey, Clinton runs neck and with other possible Republican candidates;

-Clinton at 44 percent to 47 percent for U.S. Sen. Rand Paul of Kentucky;

-Clinton and U.S. Sen. Ted Cruz of Texas tied at 44 - 44 percent;

-Clinton at 43 percent to 45 percent for U.S. Rep. Paul Ryan of Wisconsin.

President Obama's job approval rating has dropped from -15 in August to -23 in November, according to the pollster.

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