Incumbent Democratic Senator Patty Murray won re-election to her fourth term in office, defeating Republican challenger Dino Rossi by five points.
[1] All of Washington's nine seats in the United States House of Representatives were up for election.
All but one incumbent ran for re-election, with the exception being Brian Baird (D) of the 3rd District, who retired.
[4] James M. Johnson and Barbara Madsen won re-election uncontested, while Charles K. Wiggins defeated incumbent Richard B. Sanders by less than 1% of the vote.
[6] Despite early leads from several Republican challengers, Democrats ultimately retained control of the Senate, winning fifteen races.