Congressman-elect Jamie Raskin (D) resigned his seat from the Maryland Senate Thursday. (Jonathan Newton/The Washington Post)

Montgomery County Democrat Jamie B. Raskin has resigned his seat in the Maryland Senate after winning election to the U.S. House of Representatives.

His letter to Senate President Thomas V. Mike Miller Jr. (D-Calvert) called the moment “bittersweet,” noting that all his experience in public office has been with the state Senate.

“I hope to bring the skills of constructive bipartisanship and civility that I learned in Annapolis with me to Congress,” he wrote in the letter, which was submitted Thursday.

Raskin, who won the Senate seat in 2006, was a leading voice within the liberal wing of the chamber, working to pass legislation that legalized same-sex marriage, restored voting rights to former prisoners, increased the state’s minimum wage and strengthened drunk-driving laws.

Montgomery County’s Democratic Central Committee is scheduled to meet Dec. 13 to decide who to recommend to Gov. Larry Hogan (R) to serve out the remainder of Raskin’s term. A group of Democratic clubs and progressive advocacy groups plans to host a forum with potential candidates on Thursdayat the Silver Spring Civic Building, starting at 6:45 p.m.

Del. David Moon (D-Montgomery), Del. William C. Smith Jr. (D-Montgomery), community activist Debbie Spielberg and Howard University business professor Darian Unger have all told the committee they would like to be considered.

In Congress, Raskin will succeed Rep. Chris Van Hollen (D-Md.), who won election to replace Sen. Barbara A. Mikulski (D-Md.), who is retiring.