The smart set in Washington has been waiting for Donald Trump to endorse John Cornyn in the Texas Senate race the way a group of meteorologists waits for rain that they themselves predicted. They were quite certain it would arrive. They were only unsure about the exact timing.

First they said Trump would endorse Cornyn before the primary. Then they said it would happen right after the primary. Then they said it would happen after the runoff field was set.

Now it has been a week.

Still no endorsement.

At this point, the D.C. political class is staring at the sky, holding an umbrella, and wondering why they’re getting sunburned.

The original theory from the capital’s professional prognosticators was simple. Cornyn is a senior Republican senator. He has the blessing of leadership. He has spent decades doing the things senators do in Washington, which mostly involve attending meetings, issuing statements, and explaining why whatever just happened was a victory for the American people.

Surely, they said, Trump would want stability. Surely he would want a reliable Republican vote in the Senate. Surely he would want the candidate who looks like the sort of man who owns several pairs of reading glasses and uses all of them.

Therefore, the endorsement would come.

Except Donald Trump has many political qualities. Predictability is not among them.

The other candidate in the race is Ken Paxton,........

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