The final outcome of the battle between U.S. Rep. David Trone (D-Potomac) and his Republican challenger, Del. Neil Parrott of Hagerstown – the state’s most competitive congressional race this year thanks largely to redistricting – remained unclear early Wednesday. With all Election Day precincts reporting, Parrott held a 51%-49% lead, with a little more than 4,500 votes separating the two candidates in the 6th Congressional District. While Parrott had a nearly 15,000-vote edge in votes cast on Election Day, Trone cut into this with leads in early voting tallies and, perhaps most significantly, mail-in ballots – a category in which...