According to The Associated Press, Laubacher won 48.8% of the vote to Boebert's 47.9% as of Friday. Libertarian candidate Douglas Mangeris captured 3%.

Laubacher, a retired two-star Navy admiral and former home-school mother from Highlands Ranch, campaigned on her national security credentials, fiscal conservatism and moderate messaging. A former Republican, she positioned herself as a pragmatic alternative in a district that had not elected a Democrat since Betsy Markey in 2008.

Boebert, a six-year incumbent and longtime ally of President Trump, emphasized tighter border security, tougher immigration enforcement, more domestic energy production and less federal spending. She told reporters Wednesday outside the U.S. Capitol that she does not plan to run for the seat again in 2028.

Douglas County proved pivotal. As of Monday, Laubacher had captured nearly 109,000 votes there — roughly 21,750 more than Boebert. Just four years ago, Republican Ken Buck won the county by nearly 26,500 votes.

Laubacher also vastly outspent Boebert, outraising her more than 10-to-1 through June, turning what was typically a safe Republican seat into an unexpectedly competitive race.

The victory is part of a broader Democratic wave that swept the midterm elections, with Democrats regaining control of both the House and Senate. Democrats now hold seven of Colorado's eight U.S. House seats.

Laubacher has already begun House freshman orientation, ending Boebert's six-year run in Congress.

Boebert's attorney, Scott Gessler, said in a statement last week that they are "investigating some very unusual voting patterns," though no formal challenge has been announced.