"It's up to us to choose
Whether we win or lose
And I choose to win."

- Mary J. Blige

Karen Tumulty begins her wrap-up of the Democratic nomination contest with this story:

Barack Obama was campaigning last October in South Carolina when he got an urgent call from Penny Pritzker, the hotel heiress who leads his campaign's finance committee. About 200 of his biggest fund raisers were meeting in Des...