How do you tell a blunder from ignorance? McCain has also referenced a no-longer existent country, Czechoslovakia, several times and confuses Sunnis with Shiites on a regular basis. He doesn't know whether he supports health insurance covering birth control and couldn't remember that he skipped a vote on the Kyl-Lieberman amendment that he criticized Obama for missing.

When is it a blunder, when is it ignorance and when is it proof that McCain is too old for the presidency?