Democratic state Sen. Jamie Raskin, a law professor who has emerged as a leading voice for progressive causes in Annapolis, won a seat in the House of Representatives from the state's 8th Congressional District on Tuesday.
Raskin promised to bring those same progressive causes to Washington, and "fight for massive reinvestment in our nation's ailing infrastructure," including the D.C. Metro system.
At a victory party in Silver Spring, he said that he wants to enact the same policies approved in Maryland, including criminal justice reform and gun control laws.
Van Hollen won his election Tuesday to succeed retiring Sen. Barbara A. Mikulski.
The 8th District, which heavily favors Democrats, is based in Montgomery County and reaches into Frederick and Carroll counties.
Raskin, who won a crowded and expensive primary election in April, defeated Republican Dan Cox, Libertarian Jasen Wunder and Green Nancy Wallace on Tuesday. He made climate change and raising the minimum wage central issues of his campaign.
He will join fellow Democrat Anthony Brown, the former lieutenant governor, in next year's House freshman class.
All eight of Maryland's House seats were on the ballot in Maryland Tuesday. The state's six incumbents — five Democrats and one Republican — all won reelection.
Baltimore Sun reporter Erin Cox and Quanny Carr contributed to this article.