I dont see how this affects the Democratic party at all. The only way this "screws" Democrats is if he runs and gets the nomination despite us all voting against him.
Right now, this is just a gross dude getting called out for his gross behavior, and rightfully so.
Unless it snowballs this is coming out too early to really impact his primary chances. In 9 months when people vote it will be old news and Iowa and NH will be focusing on something else.