Bill Kristol is hinting that McCain may pick Louisiana Governor Bobby Jindal as his running mate, after mentioning his polling numbers:

Maybe that's why, in separate conversations last week, no fewer than four McCain staffers and advisers mentioned as a possible vice-presidential pick the 36-year-old Louisiana governor, Bobby Jindal. They’re tempted by the idea of picking someone so young, with real accomplishments and a strong reformist streak.

It might also be a way to confront the issue of McCain's age (71), which private polls and focus groups suggest could be a real problem. A Jindal pick would implicitly acknowledge the questions and raise the ante. The message would be: "You want generational change? You can get it with McCain-Jindal — without risking a liberal and inexperienced Obama as commander in chief." I would add that it was after McCain spent considerable time with Jindal in New Orleans recently, and reportedly found him, as he has before, personally engaging and intellectually impressive, that the campaign's informal name-dropping of Jindal began.

I don't see it happening, but it would be an interesting choice. Jindal just got elected, and he served a few years as a US Representative, so I don't think he's really had time to really accomplish anything.

And they made fun of Dan Quayle's youth and inexperience, though he was at least in his 40's when he became VP. I think people might be a bit nervous about being a heartbeat away from a President in his 30's.