Somewhat silly predictions aside, it's time to look at the results of the primary. A few observations.
1. Voter turnout was way below average in King County--around 20%, compared to 27%+ statewide--which may have artificially inflated Rossi's overall performance. Rossi's camp is probably praying this trend continues into the general election, since King County went 60% for Gregoire this time around.
2. As David Goldstein notes, there's no comparing this primary with the previous primary in 2004, in which voters had to choose a party, not any old candidate. The best comparison is between this primary and the general election of 2004. Provisionally, I agree with him that this is a "straw poll" for Gregoire, and that her win is a genuine win. In other words, since voters were free to choose any candidate, just as they can in the general election, the predictive power of the "top two" primary is considerably stronger than some, like David Postman of the Seattle Times, have claimed, even if Gregoire still isn't a sure thing.
3. Considering #1 above, and the natural incumbent advantage, and the fact that Gregoire's people are probably concerned that their candidate didn't top 50%, I'd predict that this primary motivates and mobilizes Democrats. Watch for a flurry of spending and campaigning, even more than last time, to secure Gregoire's lead.
4. Terry Bergeson has to feel great that she outpolled Randy Dorn. She has to be nervous, though, that "anybody but Bergeson" was the clear winner. If even David Blomstrom could siphon 4% of the vote, the electorate is clearly displeased by the current administration. Whether Dorn can rally all the opposition, though, remains to be seen. Blomstrom's probably going to call me a media whore no matter what, but I wasn't horribly impressed by Dorn's approach and his sketchy past--and partly due to Blomstrom's own efforts to raise tough questions about Dorn's past. Dorn seemed like the least worst option. I miss Rich Semler.