(The Center Square) – In his first campaign trail stop since surviving an assassination attempt and accepting the party nomination at the Republican National Convention, Donald Trump on Saturday appealed to auto workers in Michigan. Mixing usual talking points on the economy and immigration, he also rose up against the “threat to democracy” chatter from his opponent. “They keep saying, ‘He’s a threat to democracy,’” Trump told thousands inside Van Andel Arena in downtown Grand Rapids, the state’s second-largest city. “I’m saying, ‘What the hell did I do for democracy?’ Last week I took a bulle…