Eileen Laubacher will be the sole Democrat on the June primary ballot in Colorado’s 4th Congressional District race, according to the results Thursday of the Democratic assembly for the district. 

A primary win will pit her against U.S. Representative Lauren Boebert, a Windsor Republican, in the November election.

A retired Navy rear admiral and former National Security Council official, Laubacher has established a substantial fundraising advantage over her rivals, raising more money than every other candidate of either party in the race combined. 

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“All of our energy, all of our strategy, and all of our focus now goes in to defeating Lauren Boebert and delivering leadership that shows up and gets things done for this district,” Laubacher said after her nomination. “We all know that we deserve better than we have right now … We deserve a representative who shows up, who works for the people and fixes what Lauren Boebert has broken.”

Boebert has “repeatedly failed to show up for the district,” Laubacher said, citing high gas prices, grocery costs and costs of health care.

Laubacher won the support of 100% of the delegates in the caucus and assembly nominating process. State Representative Bob Marshall, a Highlands Ranch Democrat, nominated Laubacher during the assembly. While he initially had many concerns about her candidacy, Marshall said “she not only overcame those concerns, she turned me into a strong supporter and a friend.”

Trisha Calvarese, whom Boebert beat by 12 percentage points in the 2024 election, dropped out of the Democratic race earlier this week. She filed a lawsuit in March that sought to kick Laubacher out of the caucus and assembly process, but a Denver judge rejected her claim that Laubacher was ineligible.

Democrat John Padora, who also intended to participate in the caucus and assembly process, also dropped out of the race.

Colorado’s primary election will be held on June 30.