Endorsements are a mixed blessing- often the endorser has as many detractors as supporters- Oprah and Teddy Boy being two who are poison to many.
Swartzenegger, on the other hand, is on a roll in California, but next year? he might lose the magic.

Can't comment on the Washington governor's endorsement, dunno know anything about the political climate there. If it is anything like British Columbia on the other side of the border, it can be a wildcard.
To vote in the Washington caucus, voters must sign a declaration pledging allegiance to the party. Will this depress the vote?
Independents will stay home or have to lie. Half of registered supporters expected to turn out, acc. to WA Sec. of State.
Pollsters are picking Obama, saying the caucus format favors him.