Mayoral candidate Mike McGinn is imploring folks at his election night party to vote before the polls close at midnight. And a PubliCola tipster reports that the McGinn campaign is doing robocalls tonight urging people to turn in their ballots at the Wallingford Center, where elections workers will be delivering ballots to the SeaTac post ofice by midnight, tonight. This election tactic, which is pretty much unprecedented in local politics, could help McGinn turn out enough voters to win tonight's close election against Joe Mallahan.