I can't recommend highly enough Ambers' careful take-down of John Harris's offering of seven different anti-Obama memes. I don't find any of them particularly persuasive, although obviously there are vulnerabilities.
What strikes me about the attacks is how scattershot they are. The right wants to argue both that Obama is a mean-ass Chicago pol and a push-over. They want to argue both that he's a socialist control freak and that the real power in Washington is Nancy Pelosi. They want to attack him as weak abroad and yet they support his Afghan surge and his attempt to rally the world to place sanctions on Iran. The inconsistencies are legion, because, I suspect, Obama's enemies have yet to get a single, compelling narrative that rings true. They didn't manage it in the campaign and they have not managed it since. He's too big and interesting a figure to be caricatured that way. The cartoonists and the comics have the same problem. He eludes them, as complicated adults often do.
Maybe an event or the passage of time will yield a more fruitful line of criticism. But so far? Not so much. Yes, he's damaged, because the environment has to be one of the toughest any new president has faced in a generation. But he has not been truly hurt. Unemployment is climbing, America, post-Bush, has very little leverage in the world, health reform is mind-numbing and worrying, the debt is soaring ... all this explains Mr HopenChange coming down to earth. But none of it really pivots off a line of Rovian attack, and none of it coheres around a single persuasive narrative.