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David Costello has a fine resume.

"Having grown up in a working-class family in Old Town and having served for more than 30 years in senior-level government positions, both in the USA and abroad – managing, not simply legislating or talking about complex multi-million-dollar programs and operations – David has the broadest and most fitting knowledge and experience to defeat Senator Collins in 2026 and best represent the people of Maine in the United States Senate.

Born in Bangor and Raised in a Working-Class Family in Old Town

Son of an Army veteran and labor organizer. Grandson of French and Irish American shoe, textile, and railroad workers.

Graduate of Old Town High, George Washington University, and the London School of Economics

​Senior Aide, Maine Secretary of State

Developed elections, campaign finance, and motor vehicle safety reforms.

​Maine State Senate Aide

​​Country Program and Regional Team Leader, United States Agency for International Development (USAID)

Conducted and managed foreign aid work in such conflict torn countries as Cambodia, Haiti, Bosnia, Croatia, Serbia, and Kosovo.

Senior Aide, Mayor of Baltimore

Directed community efforts to improve City’s schools and City's assistance to children, youth, and families at risk.

Assistant Secretary, Maryland Department of Planning (MDP)

Managed cross-agency efforts to support smarter, more sustainable growth.

Senior Aide, Governor of Maryland

Directed cross-agency efforts to achieve Governor’s most important goals.

Deputy and Acting Secretary, Maryland Department of the Environment (MDE)

Helped to manage 1,000+ employees, various programs, and $380 million annual budget.

Climate Action Now! and Energize Maryland Projects Coordinator

Directed foundation funded projects to aggressively tackle climate change."