WaPo’s Margaret Sullivan: “If comparable disaster in November robs well-intentioned voters of their chance to be heard — or worse, gives bad-faith partisans an excuse to undermine the credibility of the vote — then the news media will bear a share of the blame.” The media is blowing its chance to head off an Election Day debacle. (It’s all about people being able to vote and have their votes counted. Neither looks like a sure thing right now.)