Before jury deliberations begin on the fate of four ex-Commonwealth Edison officials after a six-week bribery trial, an attorney for one of the defendants got emotional Monday afternoon when imparting the weight of the jury’s task.“Be the shield that you were meant to be,” Patrick Cotter told jurors after gathering himself. “The shield between an individual citizen and a very powerful government, in this case a very powerful government committed, dedicated and on a mission to get Mike Madigan.&rdquo …