A Wisconsin congressional candidate has been arrested on hate crime charges after he went on a vulgar caught-on-camera rant against an Israeli dad with his young son in the car — after he was triggered by an anti-Hamas bumper sticker. Matthew Arndt, 54, allegedly cut off the 41-year-old father on a road in the Milwaukee suburb of Mequon Thursday morning, flipping him the bird and cursing at him before pulling into a gas station, where the dad followed him and began filming the explosive encounter. “Do you want to tell me something?” the father asked. “Yeah, you’re a f------ piece...