Can Trumpism survive without President Trump?

During the past four years, President Trump has asserted such an intense influence on the Republican Party that it can be hard to imagine the GOP without him as its standard bearer. But Joe Biden’s victory in the presidential race means Republicans now have to consider life after Trump in the Oval Office.

Trump’s relationship with the GOP hasn’t always been congenial. He once was a registered Democrat and frequent donor to Democratic candidates. He seriously flirted with a Reform Party presidential bid in 2000. In his 2016 bid, Trump...