“I refuse to accept the proposition that Donald Trump is the ‘inevitable’ Republican nominee for President,” Eric Levine, a New York lawyer and Republican fund-raiser, wrote in an email to roughly 1,500 donors, politicians, and friends according to The New York Times. “His nomination would be a disaster for our party and our country.” The donor class reflects the pre-Reagan liberalism of the Rockefeller Republicans who were socially liberal yet favored fiscal restraint and have little in common with the current base of the party. Trump’s ascendancy has also deprived them of a base, as millions of liberal-leaning Republicans, particularly...