2024 congressional campaign In October 2023, after U.S. Representative
John Sarbanes announced that he would not run for re-election in 2024, Dunn expressed interest in a run for his seat in
Maryland's 3rd congressional district. He officially entered the race on January 5, 2024, running in a crowded Democratic primary field that included five state legislators—
Mark S. Chang,
Sarah Elfreth,
Terri Hill,
Clarence Lam, and
Mike Rogers. If elected, Dunn would have been the second Capitol Police officer elected to Congress after
Harry Reid's initial election to
Nevada's 1st congressional district in
1982. As a result of his strong fundraising ability and online presence, Dunn was seen as a frontrunner in the race alongside Elfreth and Lam. As of April 2024, Dunn led his opponents in fundraising with $4.5 million in contributions. During the Democratic primary, Dunn campaigned on abortion, infrastructure, healthcare, and gun reform. He received endorsements from various Democratic celebrities, including U.S. Representatives
Nancy Pelosi,
Jim Clyburn,
Adam Schiff, and
Jasmine Crockett, but none from elected officials within the district. He also expressed support for Israel and its right to defend itself amid the
Gaza war, opposing conditioning U.S. aid to Israel. Dunn also voiced support for a bill to provide $74 billion in funding to Ukraine and Israel and humanitarian aid to the
Gaza Strip. Dunn supported an amendment introduced by U.S. Senator
Chris Van Hollen that would condition U.S. foreign aid on a country's compliance with international law, but later reiterated that he would only support requiring countries to comply with existing conditions as opposed to establishing new conditions. Dunn was defeated in the Democratic primary election by state senator
Sarah Elfreth on May 14, 2024, placing second with 25.0 percent of the vote. He conceded defeat that night and endorsed Elfreth in the general election.
Post-campaign political career Following his defeat, Dunn started his own political action committee, Democracy Defenders PAC, to support candidates running against pro-Trump Republicans. In an interview with
Maryland Matters in July 2024, he said that the PAC would not spend heavily on its endorsed candidates because he didn't want it to be seen as the PAC putting its thumb on the scale. in
swing states alongside fellow former U.S. Capitol Police officers who were present at the U.S. Capitol during the January 6 Capitol attack.
2026 congressional campaign On February 4, 2026, Dunn announced that he would run for the U.S. House of Representatives in
Maryland's 5th congressional district, seeking to succeed U.S. representative
Steny Hoyer, who is retiring. During his campaign, he described himself as being "law enforcement 100%" but against
U.S. Immigration and Customs Enforcement, calling for
the agency's abolition and supporting bills in the
Maryland General Assembly to restrict ICE activity and prohibit counties from entering into
287(g) program agreements. ==Personal life==