We all know at this point that Romney is a compulsive liar, probably psychotic, and even sociopathic. He lies with impunity. As I listened to Romney lie yet again today, I thought about those used car salesman that try to sell lemons to unsuspecting buyers.
So I'm thinking, at the next debate, instead of calling Romney a liar or saying that he isn't being truthful, President Obama should start every response to a Romney lie with:
"Show me the Carfax".
Of course, he would have to, in response to Romney's first lie, which will be in his first response (he can't help himself), Obama should say, "you know, this reminds me of the used car salesman that fixes up a car to last right past the deadline for the Lemon law when the buyer can get their money back, and when the buyer says, 'show me the Carfax', the salesman starts talking faster and pretending like he doesn't hear them."
After that, all he would need to do when Romney lies is say, "Once again, show us the Carfax" and then completely dismantle Romney by pointing out every time he said the opposite of what he just said or when he made a public proclamation only to have his campaign walk it back in a statement.
In the closing argument, focus on what he wants to do, how America always knows where he stands and how his "core" is strong. Make the entire closing statement about his principles and his core.
I'm no strategist, but it sounds like a plan to me.