Mitch McConnell has a theory as to why Dems keep demanding that the supercommittee hike taxes on the rich as part of its solution to the deficit:

“I’m now convinced that the president actually believes he would be benefited by the committee not succeeding” because success “would step on his story line that we can’t do anything on a bipartisan basis.”

That is a pretty crazy story line! Where would Obama have gotten the whacked out and delusional idea that Senate Republicans won’t let him do anything on a bipartisan basis? Maybe from ... Mitch McConnell:

“We worked very hard to keep our fingerprints off of these proposals,” McConnell says. “Because we thought — correctly, I think — that the only way the American people would know that a great debate was going on was if the measures were not bipartisan. When you hang the ‘bipartisan’ tag on something, the perception is that differences have been worked out, and there’s a broad agreement that that’s the way forward.”

It’s certainly possible that McConnell adopted this strategy for purely principled and/or ideological reasons, and not cynical ones. Blocking Obama’s policies has been absolutely paramount to prevent the country from sliding into ruin, and any perception of bipartisan support for them would have made it easier for them to become law. So denying them bipartisan support at all costs has been necessary to save the country.

But even if you accept the most charitable interpretation of McConnell’s motives, it is an established fact that Republicans consciously denied Obama bipartisan support for his proposals in order to avoid any perception of bipartisan agreement, even on policies containing ideas Republicans once supported. McConnell told us so himself! So the Obama “story line” that McConnell referenced here was authored — whether for principled, ideological, or cynical reasons, or some combination of the three — by none other than McConnell himself.