For whatever reason, Trump seems to be getting the “cranky old guy who bashes his own party” vote that Ron Paul used to get and that Rand Paul thought he would get. Turns out the bulk of Ron Paul’s people don’t care about libertarian values and legalizing pot, they just liked Ron Paul’s style.
Given that Trump is leading or tied with Hillary in most polls I’d say it’s a helluva lot more than “cranky old guy” support. Trump leads all GOP in young, women and conservatives, ad well as, in 2 statute polls, Hispanics.