The superdelegates were free to vote for any candidate at the National Convention and were selected by the Washington State Democratic Party's officials and the pledged delegates.

They were allocated to the presidential candidates at the State Convention based on the preference of the 51 district delegates on June 13–15.

[4] The week before the caucuses, Senator Barack Obama was endorsed by Washington Governor Christine Gregoire.

To vote, participants completed a form with their contact information and candidate preference.

The form also asked voters to sign an oath stating: "I declare that I consider myself to be a DEMOCRAT and I will not participate in the nomination process of any other political party for the 2008 Presidential election."

[6] Unlike other state Democratic Party caucuses, Washington does not require a 15% threshold for allocation of delegates at the precinct level.

Each of Washington's 39 counties has a local Democratic Party organization that determined the event at which delegate selection would take place.

[1] Primary date: February 19, 2008 National pledged delegates determined: 0 (of 78) Dashes indicate districts for which results are unavailable.