Washington needs to hold a Presidential Primary
The voters should have a chance to express their preferences. I personally would like to avoid the melee on February 5th and make a separate stand on the 12th or the 19th. But, realistically, February 5th is shaping up to be a "winner take all" national primary and we should be part of it.
But, Washington's primary law does not provide a mechanism for determining the individual delegates to the National Conventions. The caucus process, Precinct, Legislative District/County and Congressional District and finally the State Party Convention(s) are still needed to determine who we send to Denver.
The parties could or may chose to apportion national delegates according to the results of the Presidential Primary. I don't think that we (Democrats) should for the 2008 cycle. I think we should use the primary to increase and leverage grassroots participation.
The Presidential Primary law Chapter 29A.56 RCW requires the Secretary of State (SoS) to provide the major parties (yes, the opposition can do this also) data on which voters selected which party or independent ballot (Note, this is different from the normal fall primary).
This data, combined with caucus locations, would allow a directed mailing to the already interested voters . This mailing would be a specific invitation to attend and participate in the caucus for their precinct and give the time and location.
These are the people needed to expand and increase participation. They are also the people who should be considered for delegates to the convention in Denver.
 An appealing side effect of this date is that Washington would be allocated an additional 8 delegates under DNC rules.
One, I currently am just a PCO and no longer a member of the State Committee.