Former Maine Democratic Senate nominee Graham Platner is scheduled to be the featured speaker at a Labor Day rally in what may be one of his first public appearances since ending his campaign. Platner won Maine’s Democratic primary for the right to challenge veteran Republican Sen. Susan Collins, but he dropped out in July after Politico reported that a former girlfriend said he sexually assaulted her. Platner denied the allegation but said at the time he left the race that he was stepping aside because of the importance of defeating Collins. Platner will appear at an event organized by Hancock...