Senate candidate Michael Bennet, right, greets a supporter during an election night watch party in Denver, Tuesday, Nov. 2, 2010. (AP Photo/The Denver Post, Hyoung Chang)
President Barack Obama, center, jokes with Sen. Michael Bennet, Colorado Democrat, left, and Colorado Gov. John Hickenlooper after Obama's campaign stop on the campus of the University of Colorado in Boulder, on Sunday, Sept. 2, 2012. (AP Photo/David Zalubowski)
President Barack Obama, center, jokes with Sen. Michael Bennet, Colorado Democrat, left, and Colorado Gov. John Hickenlooper after Obama's campaign stop on the campus of the University of Colorado in Boulder, on Sunday, Sept. 2, 2012. (AP Photo/David Zalubowski)
Sen. Michael Bennet, Colorado Democrat, walks with his three daughters to his polling place for early voting on Friday. From left are Caroline, 10; Anne, 5; and Halina, 9. (Associated Press)
ASSOCIATED PRESS PHOTOGRAPHS From left, Sen. Tom Udall of New Mexico, Sen. Michael Bennet of Colorado and Sen. Claire McCaskill of Missouri, all Democrats, said they are unimpressed with the way the Senate works and have offered their own suggestions on how to better it.
Senator Michael Bennet, D-Colo., celebrates with his wife Susan Dagget after winning the Democratic primary at an election party on Tuesday, Aug. 10, 2010 in Denver. (AP Photo/Ed Andrieski)
Sen. Michael Bennet, center, D-Colo., celebrates after winning the Democratic primary on Tuesday, Aug. 10, 2010, in Denver. He was joined on stage by his wife, third right, children, Senator Mark Udall, left, and Gov. Bill Ritter, back right. (AP Photo/Ed Andrieski)
Andrew Romanoff, center, candidate in the Democratic Primary race for the U.S. Senate seat in Colorado, bows his head as supporters clap during his concession speech to incumbent Democrat Michael Bennet in Denver on Tuesday, Aug. 10, 2010. (AP Photo/Chris Schneider)
Sen. Michael Bennet, Colorado Democrat, celebrates with his wife, Susan Dagget, at an election party on Tuesday, Aug. 10, 2010, in Denver after winning the Democratic primary. (AP Photo)
