Yesterday, the Post’s Glenn Kessler reported that he had asked Mitt Romney’s campaign to back up his claim that his “five point plan for the middle class” will create 12 million jobs. The Romney camp responded with a series of studies that didn’t do anything of the sort — they literally didn’t support Romney’s actual policy proposals in any way — thus revealing that his jobs plan has absolutely no credible foundation.

Romney’s claim that his plan will create 12 million jobs is the single most important promise of his entire candidacy — his leading agenda statement on the most important issue of this campaign, i.e., who will fix the economic crisis. It is the centerpiece of his whole case for the presidency, and of his argument that he represents an alternative to the unacceptable status quo under Obama.

So you’d think it would be newsworthy that his plan has been revealed to have no policy rationale behind it at all. You’d think it would be a big story that it has been revealed as a complete sham. Yet there’s been very little media interest in the story.

Perhaps this will change things. Today, Obama directly targeted the new revelations about Romney's plan, tying them to Romney’s bogus tax math, and ridiculing the whole package as a “sketchy deal”:

As I’ve been saying here, Romney is at his absolute best when he is marshalling statistics to indict the Obama economy, and there is a very real danger that undecided voters will conclude that Romney is the man with the right plan to fix things. Obama needs to spell out as clearly as possible that the economy currently is recovering and that Romney is peddling a bill of goods to the American people when he says his plan would fix things faster — a bill of goods that has been peddled to them before.

These new revelations show as clearly as you could want that Romney’s plan is, indeed, nothing but a bill of goods. After all, Romney’s own campaign can’t back up the plan’s lofty promises. By any reasonable measure, this is at least as important a story as Romney’s refusal to explain how his tax plan will be paid for — something that did receive a good deal of skeptical media coverage. This latest deserves the same. But it may require Obama and Democrats to hammer away at it relentlessly until that happens.