Play of the Day -- Romney's new campaign slogan: 'What happened?'

Late-night hosts rehashed Tuesday's primary results last night.

"I haven't seen Rick Santorum so happy since they cancelled Will and Grace," Jay Leno joked about the former Pennsylvania Senator's victories.

"It was a big, big setback for the Mitt Romney campaign. Even the very poor said they felt bad for him," David Letterman quipped.

Don't miss today's Must See Moment at 1:41 when you can see what President Obama was really aiming for when he launched a marshmallow across the State Dining Room at the White House science fair: