Yes, he really said that.

Via NRO’s Jim Geraghty:
Jim Messina, campaign manager for Obama for America, e-mails Obama supporters:
The path ahead for Romney — or whichever of the Republican candidates is going to emerge from this process — is sadly and starkly very clear: to run even further to the extreme right, and make even more dangerous promises that threaten not only the progress we’ve made but the fundamental fabric of American society.
We also know that candidates who take these extreme positions can, in the right circumstances, win not only a primary but also a general election in just about any state. Just ask the Tea Party senators from Pennsylvania and Kentucky, and the Tea Party governors in Florida and Wisconsin.
Watching the circus on TV, it’s tempting to think it’s almost funny — but this is not a joke.
