By Jonathan Bernstein, Bloomberg View

Speculation over a contested convention -- when no candidate enters with the majority needed for nomination -- has picked up steam again. The Washington Post’s Robert Costa reported last week that Republican National Committee chairman Reince Priebus met with senior Republicans about procedures, should an open convention develop.

Smart analysts are on board: Sean Trende at RealClearPolitics believes the “most likely scenario is still that no one wins a sufficient number of delegates to claim the nomination,” while Nate Silver puts the odds “at...