Update to this story. As you can see from the video, starting around 1:10, he appears to have accidentally touched her with a sheaf of papers he had in his hand. No sexual assault, but a definite assault by the 15 year old on the older male Trump supporter.
Via Buzzfeed:
Authorities said Thursday that they will not pursue sexual assault charges against the man accused of groping a 15-year-old girl as she protested a Donald Trump rally in Wisconsin.
Instead, they said, the girl may face disorderly conduct charges for punching him in the face.
Janesville Police Chief David Moore said during a news conference that investigators viewed several videos of the confrontation that occurred on Tuesday and interviewed 13 witnesses, including the accused man, 59-year-old Daniel Crandall. But they ultimately found no evidence to support allegations that the girl, who has asked to be identified as Alex, was sexually assaulted.