A liar is a liar is a liar.
Surely, at some point, there will be a contest to name Mister Obama's biggest and most Goebbelsian lies, perhaps to rank the 10 ten. This one is a sure contender.
With the help of some file footage, and enterprising GOP candidate could make several excellent campaign commercials from his whopper, n'est ce pas?
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The scary thing is, he's not lying. He truly believes each new statement is the truth, regardless of what he said five minutes ago. He's the living embodiment of leftist thought, where every "truth" is fungible, and is ontologically true as long as it serves the purposes of the situation.