American Bridge 21st Century

American Bridge 21st Century or AB PAC is a liberal American Super PAC and opposition research group that supports Democratic candidates and opposes Republican candidates. It was founded by David Brock in 2010 and is associated with Media Matters for America.

American Bridge 21st Century is an opposition research hub for the Democratic Party. The group physically tracks and monitors Republican candidates and officials and uses social media to deploy its findings.

According to Politico, American Bridge 21st Century is "one of the largest and most public facing organizations affiliated with the Democratic Party." In 2020, the group spent $73 million, "making it one of the most prolific outside spenders on either side of the aisle." In 2024, the group expanded to target U.S. House candidates for the first time; it had previously focused only on presidential races, the U.S. Senate, and state races like governorships. American Bridge 21st Century plans to spend $140 million on ads attacking Donald Trump in the 2024 election.

Methods
In 2013, American Bridge PAC employed over 50 trackers to follow and record Republican candidates across the country. These trackers are equipped with high-tech recording gear and are assigned Republican targets to follow and record. According to The New York Times, the organization "aims to record every handshake, every utterance by Republican candidates ... looking for gotcha moments that could derail political ambitions or provide fodder for television advertisements by liberal groups." USA Today described the group's goal as "uncovering an unguarded moment, a controversial position, a gaffe or flip-flop, anything that can be used to torpedo a political foe's campaign." The organization compiles opposition research dossiers on the Republican candidates they are targeting. The group's opposition dossier on Mitt Romney was 2,500 pages long. It has attempted to tie Republican candidates to the political activities of the Koch brothers.

In 2016, American Bridge discovered that the Trump Institute's book was plagiarized, with at least 20 pages coming from a 1995 Success article. In 2018, it spent $20.9 million, mostly on employee salaries including the opposition researchers.

In January 2024, American Bridge 21st Century announced plans to spend $140 million on an anti-Donald Trump advertising campaign designed to appeal to working class women in the swing states of Pennsylvania, Michigan and Wisconsin. In May 2024, as part of this advertising campaign, the group spent $25 million on ads criticizing Trump on abortion policy.

Donors
American Bridge PAC is largely funded by wealthy Democratic donors, labor unions, and other PACs (Sixteen Thirty Fund/Arabella Advisors). The largest donors of the 2020 United States presidential election cycle include billionaire Stephen Mandel, Bain Capital co-founder Joshua Bekenstein, real estate Titan George M. Marcus, and LinkedIn co-founder Reid Hoffman. In past election cycles billionaire George Soros and others helped the then fledging Super PAC in 2012.