A federal jury on Tuesday convicted three ex-lobbyists and the former CEO of electric utility Commonwealth Edison for their involvement in an alleged bribery scheme aimed at longtime Illinois House Speaker Michael Madigan.Former ComEd CEO Anne Pramaggiore and Mike McClain — the utility’s longtime contract lobbyist and close confidant of Madigan — were each found guilty of nine counts of conspiracy bribery and falsifying records. Former City Club of Chicago President Jay Doherty, who also served for …