also, my conversation with the mother and sister of joseph wilcox, the hero of the shooting in las vegas, the man who tried to stop the shooters in the walmart and lost his life doing so. those stories tonight, the ridiculist, and a lot more at the top of the hour. >> all right, anderson. sounds great. david versus goliath. a little known professor defeats the second most powerful republican in the house. many are asking today who is dave brat, the man who handed eric cantor this stunning defeat? well, joe johns found out. >> reporter: the surprise of the year in american politics was pulled off by a guy who did not expect to win. >> this is the happiest moment obviously of my life. >> reporter: he was as unprepared for victory as he was for the tough questions. when asked about arming the rebels in syria, this is how he responded. >> i thought we were just going to chat today about the celebratory aspect. >> reporter: following that sudden stumble, the candidate's two-person paid staff reversed plans for an afternoon news conference, saying instead they would issue a statement. it was a chilly welcome to