1978 United States Senate election in Colorado

The 1978 United States Senate election in Colorado took place on November 7, 1978. Incumbent Democratic Senator Floyd Haskell ran for re-election to a second term, but was soundly defeated by Republican U.S. Representative William L. Armstrong.

Candidates

 * William L. Armstrong, U.S. Representative from Littleton
 * Jack Swigert, astronaut