Doug Mastriano first burst onto the national scene on Nov. 25, 2020, when he led a hearing in Gettysburg during which aggrieved Republican voters, Rudy Giuliani, and former President Donald Trump himself aired baseless allegations of fraud in the presidential election. But Mastriano, a GOP state senator from Franklin County, couldn’t have pulled that off by himself: A colleague, State Sen. Dave Argall, let Mastriano use the panel he chaired to host the hearing. It was a harbinger of things to come. For weeks leading up to Mastriano’s victory Tuesday in the Republican primary for Pennsylvania g...