Mitt Romney: LIAR
First, Romney “quotes” the President as saying “if you’ve got a business, you didn’t build that”:
The full quote from President Obama is considerably different; there’s a video clip of it after the break.
This youtube video appears to have been posted by someone opposed to Obama, since they edited in a second pass of the fragment Romney quotes. But whoever put this at youtube was honest (or at least not a bald-faced liar like Romney) — they included the context.