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David Costello is a Brunswick, Maine Democrat whose career includes serving as Acting Secretary of the Maryland Department of the Environment, along with roles at the Maryland Department of Education, the City of Baltimore, and USAID. He was the 2024 Democratic nominee for U.S. Senate, finishing third against independent Angus King. In 2026 he again ran in the Democratic Senate primary against Janet Mills and Graham Platner on a climate- and health-care-focused platform, but was not competitive in the June 2026 primary. [David Costello - Ballotpedia ↗]
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