Go Already!

Since it is abundantly clear that Hillary Clinton cannot catch Barack Obama in pledged delegates, the prolonging of the Democratic primary is not going to endure Obama to the voters of swing states:

Not only is the opportunity cost--to wrap up the nomination, and spend John McCain into the ground for four months--uniquely high, but the venue could not be less convenient. Pennsylvania is a swing state that Democrats will almost certainly need to win in November, and Clinton will spend seven weeks and millions of dollars there making the case that Obama is unfit to set foot in the White House. You couldn't create a more damaging scenario if you tried.

More on that logic here.