Mark Halperin: Kamala Should Have Known Herself Better Before Running

Mark Halperin: "[Harris] shouldn't have run. When Joe Biden called her and said, 'I'm not gonna run maybe,' she should have said, 'You know what, I'm not gonna run either, because I can evaluate my capacity to beat Donald Trump in 100 days, and I'm not the right person. There may not be someone better, but I know it's not me.'"