The race between incumbent Democratic Sen. Michael Bennet and Republican challenger and Weld County District Attorney Ken Buck was too close to call as of Wednesday morning.

The Denver Post projected Sen. Bennet as the winner at 8 a.m. Wednesday, but 9NEWS is not ready to call the race due to the number of votes left to be counted.

As of 4 a.m. the candidates were within a few thousand votes of each other, with more than 1.4 million ballots counted. Thousands of provisional and write-in ballots still must be counted.

"We're seeing a ground swell of support for Michael across the state and that's encouraging," Trevor Kincaid from Michael Bennet's campaign said early Wednesday. "This race is very close but we believe that when every single vote is counted Michael will come out on top."

Earlier on Tuesday there was a reported miscount stemming from an Associated Press error. A representative from AP said they have since corrected the error after "gifting" Buck with 40,000 extra votes.

Buck was first elected Weld County district attorney in 2004 after working, in his words, as a "truck driver, high school football coach, ranch hand, school janitor, paper boy, furniture mover, adjunct law professor and businessman."

Gov. Bill Ritter (D-Colorado) appointed Bennet to the spot in January 2009 after Ken Salazar was named Secretary of the Interior by President Obama. Bennet was the Denver Public Schools Superintendent at the time and had never run for office before. Throughout the campaign, Buck and his supporters tied Bennet to the President for his support of the stimulus and health care reform.

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