This new ad from the Obama campaign is set to start running in nine swing states — and it’s backed by a "significant” buy, I’m told, though we still don’t know what kind of money is really behind it:

“Our businesses have created almost 4.3 million new jobs over the last 27 months, but we’re still not creating them as fast as we want,” the ad says. “The President’s jobs plan would put teachers, firefighters, police officers and construction workers back to work. Right now. And it’s paid for by asking the wealthiest Americans to pay a little more. But Congress refuses to act. Tell Congress we can’t wait.”

The political context here is that Mitt Romney has debuted a new message of late, telling Americans that Obama doesn’t have any jobs plan — even as he continues to slam Obama for blaming Congress for ... not passing the jobs plan he supposedly lacks.

Romney is operating from the calculation that swing voters will hold Obama solely responsible for the state of the economy, and won’t factor in the basic history of the last three years into their decisionmaking, leaving Romney free to claim whatever he wants about what’s been happening. There’s plenty of evidence that he may be right in this calculation — particularly with the anemic jobs numbers we’ve been seeing.

This new ad doesn’t directly name Republicans for blocking Obama’s jobs plan, only faulting “Congress” for failing to act on it. Perhaps the campaign is trying a new tack — reminding voters that Obama does in fact have a jobs plan, without tainting it with an overtly partisan message.