Former Gov. Chris Christie (R-NJ) said Sunday on ABC’s “This Week” that former President Donald Trump is “juvenile” for criticizing Gov. Brian Kemp (R-GA). Christie said, “You can’t imagine anyone who knows anything about politics would say, ‘Here’s an idea. Go and question whether or not Kamala Harris is really black or not.’ This is what happens, and this is how you can tell that this race is changing because what happens is when Donald Trump is ahead, and he feels like he’s comfortably ahead, he is willing to go with conventional, smart political advice. As soon as he thinks...