Brendan Nyhan, writing for The New York Times:

Mr. Trump is playing a character we created — a Frankenstein’s monster of myths of the presidency come to life.

Other politicians can’t easily knock down his claims given their own proclivity for making exaggerated promises and claims about what they will accomplish as president. Mr. Trump is in a sense calling their bluff.

Commentators find themselves in a similar bind. Those who often blame presidents for not turning around the economy or failing to exert powers beyond the capacity of the office may find it difficult to hold Mr. Trump accountable. After all, he’s only claiming to possess the Green Lantern-style powers that they’ve previously suggested presidents should exercise.