Donald J. Trump is essentially two key states from the nomination.
By sweeping five states on Tuesday, he pulled only a few hundred Republican delegates short of the 1,237 he needs to win without a contested convention. …
One big reason Mr. Trump’s math looks so good is something he has complained mightily about: party rules. In fact, the delegate rules (mostly favoring the winner, as opposed to proportional allocation) worked in his favor on Tuesday, and those rules allowed him to amass nearly half of the pledged delegates heading into the night, despite 38 percent support in the popular vote. CONT.
Nate Cohn, New York Times