Victory is far from inevitable. The temptation to turn the party into a haven for cosmopolitan meritocrats who feel out of place in Trump’s America will be strong. Moderates will argue that winning back working-class voters enamored of Trump is a doomed enterprise, especially if the wealthy continue fleeing the Republican Party—and when their dollars can fund efforts to woo Trump’s reluctant suburban backers. But in politics today money isn’t what it used to be, a lesson that cost Hillary Clinton, Jeb Bush, Ted Cruz, and Marco Rubio almost a billion dollars to learn. What matters most is the passion generated by the right campaign at the right time. The donor class couldn’t buy that in 2016, and they won’t be able to in 2020.