NOT A REPUBLICAN:

So far, Mr. Trump has won every primary in a state carried by Barack Obama in 2012, with the exception of John Kasich's home state, Ohio. Mr. Trump is expected to win in California and along the Acela Corridor, which vote in the second half of the primary season. If he eventually gets a majority of delegates to the Republican convention, it will be because of the 15 or so most reliably Democratic states.

But Mr. Trump's blue-state appeal is a little hard to explain. It's well established that he fares best among less educated voters. Yet his strongest performance so far wasn't in Mississippi, where he got 47 percent of the Republican vote, but in Massachusetts, a famously liberal state, where he won 49 percent of Republican voters. 

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