Donald Trump Rallies for . . . Donald Trump

Mr. Trump held a rally Saturday in Latrobe, Pa., ostensibly to boost turnout for GOP Senate candidate

Mehmet Oz

and nominee for Governor,

Doug Mastriano.

Mr. Trump endorsed both men in the primaries, and Mr. Mastriano is trailing in the polls. Mr. Oz is in a tight race with Lt. Gov.

John Fetterman,

and his defeat could cost the GOP control of the Senate. There’s little doubt that

David McCormick,

who lost narrowly to Mr. Oz after Mr. Trump’s endorsement, would be winning handily against the far-left Mr. Fetterman.

But as usual with Mr. Trump, the rally turned out to be less for Mr. Oz than for . . . himself. During the rally Mr. Trump showed the results of a recent poll for the GOP presidential nomination in 2024.

“We’re winning big, big, big in the Republican Party for the nomination like nobody’s ever seen before,” Mr. Trump said as the numbers went on screen. “There it is, Trump at 71. Ron DeSanctimonious at 10%.”

That was a shot at Florida Gov.

Ron DeSantis,

who is running for re-election in Florida, which is now Mr. Trump’s home state. Mr. DeSantis is ahead in the polls, but the election isn’t over. Perhaps Mr. Trump thinks that if he can reduce the Governor’s margin of victory on Tuesday Mr. DeSantis will be less likely to challenge him for the nomination.

Mr. Trump kept going, mocking his former Vice President, who is also considering a run for the White House. “

Mike Pence

at 7—oh, Mike’s doing better than I thought,” he said.

Then he brought up

Ted Cruz,

the Texas Senator who ran against Mr. Trump in 2016 and could run again.

“Ted Cruz is doing a good job, by the way. He didn’t like me for a while but we got to be friends, right? Could’ve put him on the Supreme Court,” Mr. Trump said. “If I’d put him on the Supreme Court, I would have had 100% of the people in the Senate voting in favor, to move him out. Okay? Even the Democrats would’ve voted for him. Okay? But he’s great and he’s smart and he’s good.” That shot at Mr. Cruz’s unlikability is best understood as a warning not to run or Mr. Trump will return to calling him “lyin’ Ted.”

Mr. Trump wants to clear the GOP presidential field, and he knows that Mr. DeSantis has emerged in the last two years as his strongest potential opponent. A declaration so soon after the election, if he does declare next week, will also be an attempt to deter a possible Justice Department indictment.

But his focus on his own prospects, and criticizing his fellow Republicans even before a crucial midterm election, is one more reminder that Mr. Trump’s only abiding principle is what’s good for Donald Trump.