Incumbent Democratic president Barack Obama safely carried the state, gaining all 12 electoral votes against Republican nominee Mitt Romney.

Incumbents Rick Larsen (D-2nd), Jaime Herrera Beutler (R-3rd), Doc Hastings (R-4th), Cathy McMorris Rodgers (R-5th), Jim McDermott (D-7th), Dave Reichert (R-8th), and Adam Smith (R-9th) ran for re-election and won.

The general election was won by Republican Thurston County auditor Kim Wyman, who defeated Democratic state senator Kathleen Drew by under one percentage point, resulting in the smallest statewide margin in 2012.

Two King County Councilmembers, Republican Reagan Dunn and Democrat Bob Ferguson, faced off in the general election.

Democratic state representative Troy Kelley won the election, defeating Republican James Watkins.