Last week’s release of the ad entitled “vulnerable” by the Commonwealth Future Political Action Committee supporting Charlie Baker is low-down dirty politics. At root, the ad suggests Martha Coakley facilitated child abuse in the Commonwealth via administrative support for the Department of Children and Families. The grey tones and sad playground visuals are all intended to leave voters thinking: Coakley does not stick up for kids. She made it easier for children to experience neglect and abuse. Stating the not so subliminal message makes evident how absurd the ad is. It’s rough. It’s ugly.