Philadelphia’s mayor warned that election workers won’t start counting mail-in ballots until Election Day — and will take “several days†to tally results — adding a critical wrinkle to the election in the crucial battleground state of Pennsylvania, according to a report.In an open letter to Philadelphia residents, Mayor Jim Kenney urged patience, WCAU reported Monday.“After the polls close, and in the ensuing days, we will continue to need your patience,†reads the letter signed by Kenney and Lisa Deeley, the chairwoman of the Philadelphia City Commissioners.“Never in the history of this city have so many people voted by mail. By...