I read with great interest David Frum’s piece on the Great Republican Revolt, Jon’s reply to it, and all of your comments. I’m very frustrated by my inability to find good polling data — as opposed to impressionistic and obviously partisan sketches — about who Trump’s supporters really are and what their political preferences really are. I don’t know whether it’s true, as Frum suggests, that there’s an important equivalence between between them European populist parties, as Frum believes:

You hear from people like them in many other democratic countries too. Across Europe, populist parties are delivering a message that combines defense of the welfare state with skepticism about immigration; that denounces the corruption of parliamentary democracy and also the risks of global capitalism. Some of these parties have a leftish flavor, like Italy’s Five Star Movement. Some are rooted to the right of center, like the U.K. Independence Party. Some descend from neofascists, like France’s National Front. Others trace their DNA to Communist parties, like Slovakia’s governing Direction–Social Democracy.