72,000http://blog.oregonlive.com/breakingnews/2008/05/obamamayvisit.htmlTens of thousands jammed Gov. Tom McCall Waterfront Park in Portland today to watch Barack Obama wrap up a busy weekend in Oregon and a historic campaign for the Democratic presidential nomination.The Portland Fire Bureau estimated the crowd at 72,000. . . .But Oregon is still very much in play.Neither candidate can gain