FILE - In this Tuesday, May 10, 2016 file photo, Democratic presidential candidate Sen. Bernie Sanders, I-Vt., speaks to his supporters during a campaign rally in Salem, Ore. The presidential race generated a lot of enthusiasm among Oregonians, with about 160,000 adding their names to the rolls of the two major parties this year - but mostly Democrats. Sanders' candidacy seems to have been the cause for a lot of the fervor, and scoring wins on Tuesday, May 17, 2016, in Oregon and Kentucky are key in his efforts to keep his campaign alive. (Danielle Peterson/Statesman-Journal via AP, File) MANDATORY CREDIT