This survey from Portland pollster Tim Hibbitts is a little old, but it's still interesting. The poll, conducted for Nike and Standard Insurance, in mid-April found that former Gov. John Kitzhaber had a lead of more than two-to-one over former Secretary of State Bill Bradbury in the Democratic primary race for Oregon governor.
The April 14-15 poll of 300 likely Democratic primary voters found Kitzhaber with 50 percent of the vote, compared to 21 percent for Bradbury and 4 percent for a third candidate, Roger Obrist.
Another 25 percent are undecided.
Bradbury had already started his TV advertising when this poll was conducted while Kitzhaber didn't start until a week ago (and his ads now appear to be running in a greater volume). This suggests that the former governor might be even better situated now than in mid-April.
http://blog.oregonlive.com/mapesonpolitics/2010/04/poll_finds_big_kitzhaber_lead.html