Impossible

  After Oregon and Kentucky, the delegate count stands at - Hillary 2,291 vs Bernie 1,528 with 2,383 needed for the nomination and with 946 still available delegates. Bernie would need 855 of those delegates to win the nomination. That is not going to happen as Bernie would need to win the remaining primaries by margins in the 90% + range. Right now Hillary Clinton is highly favored to win California.

MSNBC: Bernie Sanders wins in Oregon, but needed Kentucky, too

Instead, the most meaningful impact will likely be on the morale of Sanders supporters as he faces a virtually impossible path to winning the nomination.