Why does Joe Biden suddenly now think that Obama IS ready to be President?

Question

A few months ago, Biden said Obama wasn't ready to be President. And yet now, suddenly (miraculously?) he thinks that Obama IS ready?

Is it because he assumes that Obama will win the Presidency, and if something were to happen to Obama, Joe himself would become President.

Answer 1

Biden must be sniffing glue, has cut off a good portion of the air going to his brain or drank some of the Obama kool-aid.

Answer 2

mccain wont be put in the same position because he chose someone so far off the map, nobody knows who it is or why he chose her.