If the Republican primary process were designed to produce an exactly proportional result based on voters' choice rather than a winner, the party would have been doomed to a contested convention almost from the start. Donald Trump, who has failed more than any other GOP presidential front-runner in recent history to unite the party behind him, would have no chance of securing the nomination, for he has won only 37 percent of primary votes so far. Keep this in mind as Trump gripes about how his opponent Ted Cruz secured all 37 delegates at the Colorado convention last weekend. The...