The Super Tuesday results make it clear that Donald Trump can still be beaten, yet also make it seem less likely that his Republican rivals will ultimately bring him down.

He holds only 33 percent of the popular vote in the returns counted so far; 35 percent if you exclude Ted Cruz’s home state, Texas. It’s a low enough number to suggest he could still lose the nomination if the field ever narrowed to a one-on-one race.

But such a contest between Mr. Trump and anyone else now seems less likely to develop soon, particularly before the winner-take-all states on March 15. The results cement Mr. Trump as a very clear front-runner for the Republican nomination.