I have no doubt that Hillary Clinton was helped by her display of emotion on Sunday, and I don’t think that’s any reason to start theorizing. If she was acting, it was a very good bit of acting — unlike her husband, who always overacted. If she wasn’t acting, then for the first time in her entire public life, she displayed an honest and believable emotion besides anger. Either way, she showed a form of emotional intelligence we haven’t seen from her before.