This is not the most consequential answer Sarah Palin has given Charlie Gibson so far, but it's indicative:

GIBSON: Have you ever met a foreign head of state?

PALIN: I have not and I think if you go back in history and you ask that question of many vice presidents, they may have the same answer.

If you look back at the 10 vice presidents since 1960 -- Johnson, Humphrey, Agnew, Ford, Rockefeller, Mondale, Bush, Quayle, Gore and Cheney -- which of those would not have met a head of state before becoming VP?

Based on their pre-veep resumes, only Agnew jumps out as a possible candidate for Palin-level isolation. But I'm curious about this. Would Palin be the only veep in the last half century to have had no contact with a foreign head of state before taking office?

I'll update this as readers offer new info.

Late Update: On it already, ABC News' Lisa Chinn reports every veep in the last 32 years has met a head of state before taking office.