One last thing this morning: Let's run the Biden choice through the Clinton mill. What do the Clintons think of this choice?
Well, I bet they're OK with it. Assume for now that Obama-Biden win and serve two terms. Biden is not really a contender to be president in 2016, when he'll be 74. Hillary will be "only" 68. She can still take a shot.
If Obama had chosen Bayh, he'd have teed up someone to run against HRC in 2016. An incumbent veep would even have been the presumptive nominee, probably. So as far as the Clintons are concerned, the good news here is that Obama left the field open for her in the future. It may help.