ALBUQUERQUE, N.M.—U.S. Sen. Jeff Bingaman has bid his farewell to Washington.

In a speech on the Senate floor Thursday, the retiring Democrats said it was an honor and a privilege to have represented the people of New Mexico in the Senate for the last 30 years. And he thanked New Mexicans for their confidence in his representation.

Bingaman will be replaced by Democratic Rep. Martin Heinrich, who defeated Republican Heather Wilson for the coveted seat.