Gov. Janet Mills launched a new campaign ad Tuesday targeting her opponent in the Democratic primary for U.S. Senate over old social media posts he made about sexual assault. The ad highlights now-deleted posts that Graham Platner made on Reddit in 2013 blaming victims of sexual assault, saying they need to “take responsibility” and “not get so (expletive) up they wind up having sex with someone they don’t mean to.” The ad marks a new, more aggressive phase for Mills, who has been trailing the political newcomer in most polls of the Senate Democratic primary. It’s Mills’ first negative ad...