This is a great night. Hillary will stay in the race and further destroy the Democratic parties unity, and McCain can now go on the begin his general election campaign.
I'm not so sure.
I believe, pretty strongly now, that Obama represents the centrifugal element of the Democratic Party. The Democrats really would do better to support Hillary from here on, because her portion of the Democratic base (unions, old people, the sparingly educated) far better reflects the electoral strengths of the party as it is constituted now, than Obama's base does.