Democrats applaud Paul Ryan's endorsement of Mitt Romney

I'm sure Mitt Romney is thrilled that Paul Ryan endorsed him this morning, but nobody is happier than the Obama re-election campaign and the Democratic National Committee.

To celebrate, the DNC put out this new web video, featuring a new version of "That's Amore" tailored especially to Romney, Ryan, and their plan to end Medicare as we know it.

As we know, Republicans love Paul Ryan because he wants to undo the New Deal, and Romney's support of Ryan's agenda is helping him in Ryan's home state of Wisconsin—among Republicans. A new NBC/Marist survey shows Romney with a 7-point lead over Rick Santorum ahead of Tuesday's primary, 40-33.

But while Ryan's plans are popular among Republicans, everybody else hates them. Despite his lead over Santorum, Romney trails President Obama according to the same poll—and he trails badly, by 17-point margin, 52-35. So although Romney might be happy to have Ryan's support now, once the primary is over, he's going to need to figure out how to use that Etch-A-Sketch of his without anybody noticing, or he's going to flame out big in November.