Former Gov. John Hickenlooper defeated former state House Speaker Andrew Romanoff to win the Democratic nomination to challenge Sen. Cory Gardner (R) in the November general election. As of 7:30 p.m. Mountain Time on June 30, Hickenlooper had received 60% of the vote to Romanoff’s 40% with 58% of precincts reporting.

The Colorado Sun described the race as mirroring splits within the national Democratic Party. Hickenlooper’s endorsers included the Democratic Senatorial Campaign Committee, while Romanoff’s included the Metro Denver branch of Our Revolution.