 Why would you want to be known as the guy that decided that he wasn't going to run again? Then you're the next Lyndon Baines Johnson. Except Lyndon Baines Johnson had physical health problems, and Vietnam had worn him down. Totally different reasons why he decided not to run again. Oh, by the way, LBJ wasn't pushed out by his own party. He left on his own volition, and it surprised a lot of people. That was 1968. This time around, imagine if Biden says, I'm not going anywhere, and then his own party...