“David Costello was born in Bangor, Maine. He earned a bachelor's degree from The George Washington University in 1983 and a graduate degree from the London School of Economics and Political Science in 1989. With a career background in environmental policy consulting, Costello ran for the U.S. Senate seat representing Maine in 2024. He lost in the general election held on November 5, 2024. Costello completed Ballotpedia's Candidate Connection survey in 2023, where he outlined his policy positions and priorities.”