A complaint filed with Michigan election officials by Democrats urges an investigation of several Republican Senate candidates for alleged signature fraud, reported Bridge Michigan on Friday. “In a Friday letter to the Michigan Board of State Canvassers, attorneys for the Michigan Democratic Party and the Democratic Senatorial Campaign Committee asked election officials to investigate nominating petitions submitted by Republican U.S. Senate candidates Mike Rogers, Sandy Pensler and Justin Amash, as well as former candidate Peter Meijer,” reported Lauren Gibbons. “The request claims that the ca…