If Paul is the nominee, he'll likely choose someone with more Neoconservative views as his VP, so I doubt the Dick will endorse a Democrat anytime soon
Plus, in order for Rand to actually get the nomination, he'll need to pander to the neocons, which will make him more palatable to Cheneyites.
In the unlikely scenario where Rand does not pander to the neocons yet wins the nomination anyway, he'll probably endorse nobody, and secretly hope for Rand's failure so he can say "see, isolationism doesn't play well, let's go back to tradition next time".
