As he flails to reverse a polling decline that is beginning to resemble a rockslide, Gov. Ron DeSantis must be feeling a little clueless about why his political fortunes are crumbling so quickly. Attacking wokeness and bullying transgender people seemed to work so well in Florida, so why aren’t national Republicans in awe of the divisions he’s deepened? Making repeated appearances with racial provocateurs never stopped him from getting elected as governor, so why did he have to fire a young aide who inserted Nazi imagery into his own video promoting Mr. DeSantis’s presidential campaign? But the political bubble inhabited...