Which Donald Trump Will Debate?

Which Donald Trump Will Debate?-wsj: Which Donald J. Trump will show up at Thursday night’s Republican debate in Cleveland? There’s the Trump who calls the other GOP candidates “clowns” and responds to criticism with schoolyard insults. Then there’s the Trump who last week tweeted about the coming debate: “it is certainly my intention to be very nice & highly respectful of the other candidates.” Mr. Trump seems to have recognized that as the candidate atop the Republican heap, he now will be held to a higher standard than he was as a celebrity polling in low single digits.