(The Center Square) – A key witness in the ComEd Four bribery case last year has taken the stand at the corruption trial of former Illinois House Speaker Michael Madigan. Former ComEd executive Fidel Marquez said he worked for the utility company for about 37 years. In direct testimony Tuesday, Marquez answered questions about his work and said he led the utility company’s legislative affairs division from 2012 to 2018. Marquez admitted that he pleaded guilty to bribery charges in 2020 and said that he had cooperated with the government in its corruption investigation. FBI Special Agent Ryan M…