But there's an argument against Trump that nobody is making -- at least not yet -- that would seem to be pretty potent. And it is this: There is the potential for multiple Supreme Court justice vacancies during the next presidential term -- four justices are 74 or older, two of whom come from the liberal side of the court and one of whom is the swing vote (Anthony Kennedy) -- which means the party that wins the 2016 election could have a huge impact on the next few decades of the highest level of jurisprudence.

This, after all, is the same court that just legalized gay marriage nationwide and upheld Obamacare twice. And Republicans have noticed; a new Gallup poll shows the court has never been more unpopular – in large part because the GOP has turned overwhelmingly against it.

If you are a GOP primary voter thinking about voting for Trump or Ben Carson, that would seem to be a pretty compelling reason to think about a more traditional/electable choice. Trump, after all, regularly polls with an unfavorable rating around 60 percent. For all his momentum in the GOP race, he's still broadly disliked.