CHARLOTTE, N.C. -

As President Barack Obama prepares for his speech tonight at the Democratic National Convention, he has some tough acts to follow.

Two days ago his wife Michelle delivered a crowd-swooning speech, and then last night it was former President Bill Clinton, the one-time "comeback kid" offering a rousing defense of Obama's economic stewardship. Clinton said, "conditions are improving and if you'll renew the president's contract, you will feel it."