It is certainly true that the further rightward you are, the less you like Mitt. He has been here doing this before, remember. And at that time he was treated with even less respect than he's getting now (cripes! McCain was considered the conservative alternative to Mitt, last time!)

The current best strategy for the Dems is to make certain that the conservative base knows how liberal he can be. Later on, in the general election, this information will be to his benefit while he tries to woo the middle. At that time the best bet for the Dems will be to publicize all his conservative quotes he has used to woo the conservatives in the primary. It is a little schizophrenic to do an about-face like that, but Mitt will be doing his own about-face at the same time.