Ken Buck and Sen. Michael Bennet are set to face off:

Incumbent Sen. Michael Bennet, who replaced Ken Salazar last year, is facing an uphill battle against Republican candidate and Tea Party favorite Ken Buck.
With the two locked in a tight race, it will come down to how they perform in the debates today and whether they can win over independent voters who comprise a large chunk of the state’s electorate.
ABC News’ Jake Tapper and KMGH anchor Mike Landess will moderate today’s debate between Bennet and Buck, as well as a debate between gubernatorial candidates — Democrat John Hickenlooper, Republican Dan Maes and the American Constitution Party’s Tom Tancredo.

The RealClearPolitics poll average shows Buck up by three. How to watch:

Watch the debates live at 1:30pm ET/ 11:30 am MT on ABC News’ Facebook page http://www.facebook.com/abcnews and on ABC News.com/Politics. http://abcnews.go.com/politics