A Staten island grand jury has identified numerous instances of ballot harvesting fraud in a race for City Council last year — including a ballot submitted on behalf of a dead person and signature fraud involving dozens of other absentee ballots. The unprecedented 38-page grand jury report released by Staten Island District Attorney Michael McMahon called for changes in state election law including requiring official government-issued ID to vote. But it does not specify the race in question, nor does it file criminal charges against anyone. Sources told The Post that the criminal investigation focused on the campaign of Marko...