Even knowing that some of their base is so ignorant that they'd buy any lie they're selling, I doubt the Dems would be stupid enough to try pinning the blame for Obamageddon on the Repubs or Bush.
I think they already realize that they'd instantly lose whatever shreds of credibility they had left among the more educated, affluent libs, who would see through something like that in a nanosecond.
I'm afraid this thing (and all of the fallout and aftereffects) are squarely on their shoulders - and they know it. All they can do now, is try their very best to find a way to distance themselves personally. I don't even know how they do that. They all voted for it.
Maybe they'll decide to do what Dems always do when everything goes south -- they'll double down. Now that will be the BIG test of wills between the people and their government, won't it?
Dems: "Take your medicine, America!"
The People: "Come and make us."