Rich Lowry: Trump Wuz Robbed

Give Donald Trump credit for planning ahead. He is preparing to be a sore loser.

Trump's complaints that he is being undone by a rigged system crafted by a corrupt Republican Party is the dress rehearsal for his campaign's closing argument should it come up short in Cleveland. Trump will, in his telling, have been stabbed in the back by insiders and be fully justified in wreaking a terrible revenge on the party that he briefly sought to lead.

Facts and logic don't particularly matter to Trump or his mouthpieces, yet the "rigged" charge is absurd even by the standards of his standard-less campa...