It turns out the winner of the Democrats' lieutenant Governor's primary in Illinois has a pretty nasty assault rap for attacking his girlfriend
back in 2005. According to police reports he slammed her head against a wall and left "mild abrasions from [a] knife wound" on her neck and "minor scars on her hand from her trying to defend herself against the arrestee swinging the knife at her."
The charges were eventually dropped because the victim didn't show up on a court date.
From a political perspective, also not helpful for Cohen is that his girlfriend at the time was a prostitute, though he says he thought she just worked at a massage parlor.