Rep. Debbie Dingell (D-Mich.) said she was troubled by social media posts that the leading Democrat in Maine’s Senate race made more than a decade ago about sexual assault.  Last year, The Washington Post uncovered online comments that Graham Platner posted in 2013, in which the Democratic candidate downplayed the difficulties service members face when reporting sexual assault.  “I was very upset as a woman who has dealt with domestic violence, grew up in a home and other sexual violence. Very upset by what his previous comments were,” Dingell said on Saturday when asked by CNN about these posts.  Platner is now the frontrunner in the state’s Democratic primary after Maine Gov. Janet Mills suspended her campaign on Thursday due to deficient campaign funds.…