In what had been considered Colorado's most Republican-leaning congressional district, incumbent Rep. Lauren Boebert has been defeated by Democrat Eileen Laubacher.

The Associated Press called the race on Friday afternoon.

Laubacher received 48.8% of the vote (187,488 votes) to Boebert's 47.9% (184,047 votes), with 99% of the vote counted. Douglas Mangeris, a libertarian, received 3.3%, or 12,720 votes, per AP. 

Boebert, an outspoken gun rights activist, has served in Congress since 2021 and is considered one of President Trump's staunchest allies on Capitol Hill.

Laubacher is a retired U.S. Navy rear admiral who was deployed in Afghanistan. She also served on the National Security Council under President Joe Biden.

Laubacher's victory adds Colorado's 4th District to the more than 40 Republican-held districts that have flipped to Democrats this midterm cycle, including two others in Colorado...