Benjamin Louis Cardin is an American lawyer and politician serving as the senior United States senator from Maryland, a seat he has held since 2007. A member of the Democratic Party, he was the U.S. representative for Maryland's 3rd congressional district from 1987 to 2007. Cardin served in the Maryland House of Delegates from 1967 to 1987 and as its speaker from 1979 to 1987.