Santorum tags Romney in SC ad

This is one of the hardest hitting ads of the campaign. Like all good political ads, it's short, it's easy to understand - and it's true:

Obama supported the Wall Street bailouts... So did Romney.

Obama gave us radical Obamacare... that was based on Romneycare.

Obama's a liberal on social issues.

Romney once bragged he's even more liberal than Ted Kennedy on social issues.

Why would we ever vote for someone who is just like Obama?

When we can unite around Rick Santorum. And beat Obama.

Time's Mark Halperin:

Amazing to think about what would have happened if this ad had been run in Iowa for all of December with real money behind it. Boston will surely note that Santorum is launching this spot the very day he spent the morning going after Romney and his Super PAC for their campaign efforts. There are more hot-button issues packed in here than there are Romney sons. The unflattering photographs of Obama and Romney are classics of the genre. And, with the exception of the Kennedy line, the claims are rock-solid factual. Will we see some of these same lines in robo-calls, emails and radio spots? As Sarah Palin, who would share some of the ad's sentiments, would say, you betcha.

Doesn't leave Romney with much of an argument, does it?