Democratic campaign strategist Chuck Rocha doesn't think Sen. John Cornyn (R-TX) has a path to keeping his seat in the GOP primary on Tuesday night — and walked through the math with MS NOW's Katy Tur on why he thinks he's a dead man walking.Cornyn has fought his way through a vicious primary that includes state Attorney General Ken Paxton and U.S. Rep. Wesley Hunt. The latter two portray Cornyn as insufficiently loyal to President Donald Trump, who has refused to make an endorsement in the race...