Obama's Magic Number

This weekend was more dizzying than a David Copperfield performance. O.K., maybe not, but it was eventful nonetheless. The Rules and Bylaws Committee apportioned delegates from Florida and Michigan. Puerto Rico held its primary. And a few superdelegates have stepped forward and declared. The upshot? Barack Obama's new magic number is 2,118 delegates. He is now 39.5 delegates shy of clinching the nomination. Hillary Clinton now has 1,916 delegates.

There are 31 delegates still up for grabs in Montana and South Dakota.