Oh? And you can prove that how? By the lying rhetoric that spills out of his mouth, or by his actual governing record?
Excuse me, but the man's governing record is indistinguishable from any hard left liberal Democrat's. What do you call a man who tells you that he's "severely" conservative, yet performs exactly like a leftist in his official duties and politics?
At least Obama is honest enough to tell you he's a liberal Democrat. The lying scumbag Romney, is an even more despicable sort of animal, because he stabs you in the back after conning you into trusting him.
Whether Mitt is genuinely leftist at heart, or whether he simply has a perpetual finger in the wind (which always blew leftward in Massachusetts) — I believe we have insufficient information to conclusively say. I lean towards the finger in the wind hypothesis, getting along to get along. That sort of politician has some hope of being leaned on to do the right thing. Obama does not.