The Obama SuperPAC has just released a web ad that should receive an R rating for violence. Watch it if you want a sneak preview of the Obama campaign.

The video, backed so far by a relatively modest web media spend of $100,000, effectively eviscerates Mitt Romney as a Tea Party-loving, right-wing tool of a heartless Wall Street. It starts, oddly, with a series of predictions — from Karl Rove and others — that Obama will lose in 2012. This is presumably to open the mind to the very real possibility that Romney could put the title “president” in front of his name. And once opened, the horrors of a Romney presidency come at you faster than a  trailer for another Die Hard movie.

The ad quotes Romney as being a fan of the Tea Party, a group independents despise. It has Romney’s “corporations are people” laugher. It features Chris Wallace of Fox, for goodness sakes, hammering Romney on why his former company, Bain Capital, laid off workers from companies it had acquired. And it closes with a kitchen sink of Romney’s affection for Justices Scalia and Thomas, social security privatization, cutting Medicare and Planned Parenthood, and on and on. It concludes with Romney saying, “It’s not a very pretty picture.” Indeed, it is not.

This is a very powerful ad, and it would scare me if I were in the Romney camp and had time to worry about next November instead of next week. But, I must say, I’m confused about the strategy of blowing up Romney in the middle of the Republican primaries, where he is doing a pretty good job of self-destructing and his opponents are piling on.  Conventional wisdom says that this ad could, perversely, help Romney with the only audience he can care about now — Republicans — because it elevates him. Perhaps it does, but it also does the devastating job of sinking him, too.