Try to remember that liberals don't have to tell the truth and for that matter, neither do a lot of semi-libs. Only true conservatives are held to account for the words they say. I think that's written into the rules somewhere, or at least that has been the tradition, so there's no use in popping a vessel over it.
Remember--Bubba said he didn't have sex with that woman? The OBama says he isn't interested in nationalizing health care--same thing.