For many of the same reasons that Jerry Brown, Ted Kennedy, Gary Hart, Jesse Jackson and others stayed in the race. They wanted to make sure that they could speak to their delegates on prime time at the national convention. They wanted to make sure that their supporters could cheer them on at the convention.

I think Obama supporters should give Clinton some space. That's the best thing they can do to heal the party. The more they scream for her to get out, the more resistant she will be in getting out. Let her get out in a way that she and her supporters can feel good. Two her best primary states in the whole country are probably West Virginia and Kentucky (The other being Arkansas). Let those states vote for her. Then on May 31st, Obama should not be too resistant to seating the Michigan and Florida delegation in proportion to the actual vote count. The Michigan plan would split the delegation 69-59 in favor of Clinton. That would be a good compromise. Fight that proposal, and this race will go on through the convention. Accept the proposal, and her aides have been talking that she would quit the race in June.