"If (when) he loses, he'll have another tantrum like he did in 2000, and may run as a third party candidate to try to screw the GOP"
I have thought this for a long time! I can see him pulling a "Perot"
I may be whistling past the graveyard here, but I think that if McInsane pulls a Perot, he'll pull votes from the RATs as well as from the Republicans. How that will affect the actual outcome of the election will depend on how it affects the state-by-state totals and hence the electoral total. However, I don't see a McInsane candidacy having the same detrimental effect that Perot did on Bush 41's re-election bid.