Because he knows Biden can’t hack it, that’s why he hasn’t endorsed him.
President Barack Obama reportedly tried to talk Sen. Joe Biden out of a presidential run just before he declared his candidacy, according to a New York Times report.
“You don’t have to do this, Joe, you really don’t,” Obama told Biden earlier this year, according to a source at the Times.
The two had spoken at least half a dozen times before Biden ultimately decided to run. “Obama took pains to cast his doubts about the campaign in personal terms,” said the Times article.