Washington was won by Democratic nominee John Kerry by a 7.2% margin of victory. Prior to the election, all 12 news organizations considered this a state Kerry would win, or otherwise considered as a safe blue state.
A solidly blue state, Washington has voted for the Democratic presidential nominee in every presidential election since 1988. Neither candidate seriously contested the state as it was viewed as a safe blue state. Like Oregon, the state is divided politically by the urban/rural divide and geographically by the Cascade Mountains. Most of the state's population resides in Western Washington along the Pacific Coast and in highly urbanized areas like Seattle; this part of the state votes overwhelmingly Democratic. The other side of the mountains in Eastern Washington is much more rural and conservative and therefore heavily Republican. While polling showed that voters trusted Bush more than Kerry on the issue of terrorism, the Iraq War and Bush's domestic policies were unpopular here. 
Technically the voters of Washington cast their ballots for electors: representatives to the Electoral College. Washington is allocated 11 electors because it has 9 congressional districts and 2 senators. All candidates who appear on the ballot or qualify to receive write-in votes must submit a list of 11 electors, who pledge to vote for their candidate and his or her running mate. Whoever wins the majority of votes in the state is awarded all 11 electoral votes. Their chosen electors then vote for President and Vice President. Although electors are pledged to their candidate and running mate, they are not obligated to vote for them. An elector who votes for someone other than his or her candidate is known as a faithless elector.
The electors of each state and the District of Columbia met on December 13, 2004 to cast their votes for President and Vice President. The Electoral College itself never meets as one body. Instead the electors from each state and the District of Columbia met in their respective capitols.
The following were the members of the Electoral College from the state. All 11 were pledged for Kerry/Edwards: