Political leanings: Democratic2024 total spending: $256 millionThe House Majority PAC, or HMP, as it is formally known, was created in April 2011 by Alixandria Lapp, a former Democratic Congressional Campaign Committee official. House Majority PAC says it is “solely focused on electing House Democrats, including protecting our most vulnerable incumbents and boosting our most promising challenger and open seat candidates.” As a Carey committee, also called a hybrid PAC, the House Majority PAC can act as both a traditional PAC, giving money directly to candidates’ committees, and a super PAC, making independent expenditures not coordinated with candidates and accepting donations of any size from individuals, labor unions and corporations. It must disclose those donations and expenditures in reports to the Federal Election Commission. A significant portion of that money came from House Majority Forward, an affiliated nonprofit organization that says it’s focused on “promoting economic growth and opportunity, social justice, environmental stewardship, and democracy.”