Colorado U.S. Senate election history

Every Colorado U.S. Senate election from 1978 to 2022: winners, parties, margins and the seats that changed hands.

Current senators

Colorado Senate races: Republican minus Democratic share, in points. Bars above the line lean Republican, below lean Democratic.

Year	Seat	Winner	Party	Runner-up	Margin	Votes
2022	Class III	Michael Bennet	Democratic	Joe O'Dea	14.6	2,500,130
2020 flip	Class II	John Wright Hickenlooper	Democratic	Cory Gardner	9.3	3,235,790
2016	Class III	Michael Bennet	Democratic	Darryl Glenn	5.7	2,743,023
2014 flip	Class II	Cory Gardner	Republican	Mark Udall	1.9	2,041,058
2010	Class III	Michael Bennet	Democratic	Ken Buck	1.6	1,772,286
2008 flip	Class II	Mark Udall	Democratic	Bob Schaffer	10.3	2,331,621
2004 flip	Class III	Ken Salazar	Democratic	Pete Coors	4.8	2,107,472
2002	Class II	Wayne A. Allard	Republican	Tom Strickland	4.9	1,416,082
1998	Class III	Ben Nighthorse Campbell	Republican	Dottie Lamm	27.5	1,327,235
1996	Class II	Wayne A. Allard	Republican	Tom Strickland	5.7	1,459,601
1992	Class III	Ben Nighthorse Campbell	Democratic	Terry Considine	9.1	1,552,289
1990	Class II	Hank Brown	Republican	Josie Heath	14.0	1,022,027
1986	Class III	Timothy E. Wirth	Democratic	Kenneth Bentley Kramer	1.6	1,060,765
1984	Class II	William L. Armstrong	Republican	Nancy E. Dick	29.6	1,297,809
1980	Class III	Gary Hart	Democratic	Mary Estill Buchanan	1.6	1,173,142
1978 flip	Class II	William L. Armstrong	Republican	Floyd K. Haskell	18.4	819,256

Michael Bennet won in 2022 by 14.6 points.

Michael F. Bennet (Democrat, term ends 2029) and John W. Hickenlooper (Democrat, term ends 2027).

In 2022, when Michael Bennet won.

In 2014, when Cory Gardner won.

Results: FiveThirtyEight (from 1976 for Senate, 1996 for governor). Current members: congress-legislators.