Papa Bush was veep for 8 years and pres for 4. W is on his way to eight years in the top spot. By the time the next election rolls around, a Bush will have been in one of the top spots for 20 out of the last 28 years.
Jeb insists that he’s not planning an ’08 run. And that may be true. It would probably be more strategic to wait four additional years (although moving quickly could mean saving money on placards). If Jeb does run and win and hold two terms (and if W can do it, Jeb might not even have to campaign at all), the Bush family would head into 2016 having held the top superpower spots for 28 out of 36 years. And keep in mind, Jenna seems to be getting into the whole public speaking thing. Planet Bush, the story continues.
Of course, if Hillary runs and somehow wins (I’m certainly not predicting the latter) and pulls off two terms herself, then the Clintons would have held the top two spots for 16 of 24 years.
Just to keep this all in perspective, Johnny Carson hosted The Tonight Show for more than 29 years. And look what happened when he ceded power.