The Race for the White House Is Finally On...or Is It?

After yesterday's wins in Wisconsin, Maryland, and the District of Columbia, Mitt Romney is acting like he's the Republican nominee to challenge President Obama. Today, as the President did yesterday, Romney addressed the convention of news executives, and accused Obama of running a "hide and seek" campaign, referring to the President's accidentally recorded comment to Russian President Dimitri Medvedev that he'd have more "flexibility" after his re-election. Meanwhile, Rick Santorum insists that it's not over yet. Does Santorum have a chance in Pennsylvania, the state that rejected his Senate re-election bid by 18 percent, or will that be his last stand?  Will he and Newt Gingrich create uncertainty all the way to the party convention, or have they become a political sideshow?