Colorado Republican Rep. Scott Tipton lost his primary Tuesday to Lauren Boebert, a gun rights activist who has also been associated with the far-right conspiracy theory known as QAnon.
He's the fourth House member, and third Republican, to lose his party's support for another term this cycle.
Tipton conceded shortly after 9 p.m. Mountain time Tuesday, according to multiple Colorado news reports. With 86% of precincts reporting, Boebert was leading 54% to 46% in the 3rd District GOP primary when The Associated Press called the race.
Awaiting Boebert in November is former state Rep. Diane Mitsch Bush, who won the Democratic nomination for the second consecutive cycle. Mitsch Bush was leading businessman James Iacino 61% to 39% when the AP called the primary.
Unlike Tipton, Boebert ran television ads during the primary. A spot released at the beginning of June urged voters to reject the incumbent and tried to connect him to New York Democratic Rep. Alexandria Ocasio-Cortez and House Speaker Nancy Pelosi.
President Donald Trump carried the district by 12 points in 2016. Tipton won a fifth term two years later, defeating Mitsch Bush by 8 points. It was his narrowest reelection since he unseated Democrat John Salazar in 2010.
Boebert owns a restaurant in Rifle, Colorado, where the staff members openly carry firearms, according to The Colorado Sun. She also grabbed headlines last year when she confronted Democratic presidential contender Beto O'Rourke over his support for an assault weapons ban and his comment in a debate, "Hell, yes, we're going to take your AR-15, your AK-47."
"I am here to say: Hell, no, you're not," Boebert told the former Texas congressman, The Denver Post reported. O'Rourke dropped out of the race in November.
Boebert has also been associated with the QAnon conspiracy theory, which centers on the belief that Trump is fighting a secret campaign against enemies in the "deep state."
According to Colorado Public Radio, Boebert appeared on a "Q-friendly web show" and said, "I hope that this is real. It only means America is getting stronger and better, and people are returning to conservative values and that's what I am for."