This was wishful thinking, and in Indiana, Mr. Trump put an end to the mirage. He defeated Mr. Cruz by more than 15 points and won more than half the vote in a seventh consecutive state — this time, in the Midwest.
There was no anti-Trump majority left to rally, if it ever existed in the first place. [...]
Mr. Trump’s emergence as the all-but-anointed Republican nominee may change this dynamic. Giving him a monthlong head start to rally skeptical Republicans behind his campaign, while Mrs. Clinton continues to grapple with Mr. Sanders’s challenge on the left, could become an intolerable prospect for Democrats eager for a free hand to engage Mr. Trump.