I think the Dems - given I get a lot of Dem news sources - are a bit bemused by the whole thing to be honest, not least because either Carson or Trump look (from current polls) like they'd be flattened by either Sanders or Clinton. For the Democrats, I think it's something of a mixed blessing; on the one hand, they're more likely to beat Trump or Carson than people like Bush or Jindal, on the other, it would set their policy goals back about a century if Trump or Carson actually won the presidency. The GOP establishment must be panicking like anything though, whilst I can't stand either Carson or Trump (and I think either would reduce the US to a laughing stock on the world stage, pretty rapidly) once certainly can say they're opposed to the party's careerist wing.
Meanwhile on the Democrat side they're having a more even battle, with Clinton as the well-funded establishment candidate and Bernie Sanders, of all people, as her main challenger from well outside the Dem establishment. Trump VS Sanders would be a bizarre presidential campaign to watch.