How the Republican establishment broke itself trying to stop Doug Mastriano in Pennsylvania

On a rainy Friday earlier this month, several leading Republican candidates for governor drove to Westmoreland County in western Pennsylvania for former President Donald Trump’s rally that evening. With less than two weeks before the primary election, State Sen. Doug Mastriano was leading in the polls, and some of the candidates and their aides were holding out hope Trump would use the rally to endorse a rival who could topple the front-runner. But behind the scenes, some of the most influential players in Pennsylvania Republican politics were hatching a plan of their own to stop Mastriano, wh...