Heck, the Ohio Was STOLEN! conspiracy theories are even easier to debunk than the 9-11 conspiracy theories. But that doesn't stop the true believers.
But hey, as long as the libs keep re-fighting the past, lost battles, they'll keep losing the current battles.
You really want to work a Lib into a frothy rage, tell him that you agree with him that Ohio was stolen. Tell him that you knew all along how it was going to be done. Hint darkly about plots among your wingnut friends to do the same in 2008.
This should push him right over the edge, into a catatonic stupor that will make it impossible to function on any useful level for at least a week.