I'm a registered Republican, but that certainly doesn't stop me from voting for Democrats. In fact, I voted for Kerry and Wu last year. I voted for Kulongoski in '02. Why did I do that?
Not because of the Democratic message, to the extent that there was any such comprehensible thing. Because I was "turned off" by the Republicans in each race, rather than "turned on" by the Democrats. ...
To a large extent, I think the Democratic party is lucky in Oregon that the Republican leadership here supports such lousy candidates, or races would be a lot closer statewide. I believe that there are a lot of suburban "weak" Republicans like myself who would love to have a decent Republican to get behind, but are willing to vote Democratic otherwise, which tends to inflate the "blue quotient" for the metro area. And that is a demographic issue that you might want to consider.