
Incumbent Sen. John Hickenlooper (D) defeated Julie Gonzales (D) in the Democratic primary for the U.S. Senate in Colorado on June 30, 2026. Ahead of the primary, Colorado Politics' Thelma Grimes wrote that "Gonzales is running on a message of generational change, arguing that Democrats need a more aggressive approach and that a vote for Hickenlooper will just mean 'more of the…