He's talked about endorsing a third party candidate if he doesn't like what he hears.
Then he"s just as dumb as you or anyone who would even consider throwing away their vote and thereby giving the Republicans the presidency, just because Hillary is not your "perfect" candidate.
Let's face it, in a winner take all system there can only be two candidates with even the remotest chance of winning. And when we speak of remote here, we are not talking about come-from-behind-victory remote; we are speaking of remote as nearly impossible. In fact, the only reason I use nearly as a qualifier is because on a metaphysical level, all things are possible. But that is just philosophy. In reality, none of the third parties has any chance. None.
Hence, voting third party is akin to not voting at all. It may have some therapeutic value or serve some quasi-religious value of personal morality for people who see voting for a candidate as a moral act -- they don't want to be 'unclean' and vote for someone who isn't in near perfect agreement with them -- they also tend to like to look down their noses at the rest of us.
In short, politics is not the realm of the moral; it is a waste if voting is about electing somebody.
Salve, Regina, Mater misericordiae
Vita, dulcedo, et spes nostra
Salve, Salve Regina
Ad te clamamus exsules filii Eva
Ad te suspiramus, gementes et flentes
O clemens O pia