According to the Oregonvotes.org website, 638,593 out of 868,371 registered Democrats voted in the primary that was held on May 20th in Oregon. This represents 73.54% in terms of voter turnout, breaking the previous record of 72% among Oregon Democrats set in 1968.
An astonishing 1,146,706 ballots were cast overall when one combines Democratic, Republican, and non-Partisan voting for a total turnout of 56.55%. Clearly, Oregon's vote-by-mail system appears to encourage a very large turnout.
It is interesting to note that before the May 20th primary, Oregon hadn't seen such high turnout in Democratic primaries since 1968. In an article entitled, "Oregon turnout expected to top 1 million," Amy Hsuan wrote in the Oregonian on May 20th, 2008 that:
In 1968, 72 percent of Oregon Democrats cast ballots in a hotly contested race between eventual winner Eugene McCarthy and Robert F. Kennedy.
http://www.oregonlive.com/...
Of course, the current tally is unofficial. The figure could conceivably grow, once the state of Oregon issues an official tally. Among votes currently counted for President only, Barack Obama leads with 366,421 or 58.48% of the vote to Hillary Clinton's 254,894 or 40.68% of the vote. There were 5,308 write-in votes representing .85% of the total.
https://secure.sos.state.or.us/...
The delegate split in the contest was Obama 31 Clinton 21.
Significantly, Obama was triumphant among rural voters, winning that category by 7 points, according to the cnn.com exit poll. In fact, he won some of the most rural counties in Oregon by almost 20 points. This confirms my contention that Obama does well among rural voters in the West and that regional considerations must be taken into account when discussing Obama's success or lack thereof with white voters.