After Rick Santorum's Sweep, How Worried Should Mitt Romney Be?

I put that question to ABC News' political contributor Matt Dowd this morning. He summed up Mitt Romney's standing in the Republican race after Rick Santorum's three state win like this:

"After Florida [Romney] thought he had gotten engaged and a wedding date was set and the voters gave him his ring back and said 'We're going to flirt with this guy from Pittsburgh for a while,'" Dowd said on "GMA." "I mean it's an amazing turn of events for Mitt Romney. He thought he had this done."

Watch our analysis of the race here: