I don't usually espouse my political views out loud, and while I would have voted for him 8 years ago (man, that seems like soooo long ago!), I think there is a very important question to ask before you check the box for John McCain:
If you are between the ages of 20 and 30, would you want your Great-Grandfather as President? You might not even have one, they're mostly dead by now...
If you're between 30 and 40, do you want to vote for your Grandfather? C'mon, you don't go visit him regularly, and if you do you, don't you roll your eyes a lot?
If you're 40-60, aren't you thinking of plans for taking care of Dad, looking into nice facilities with backgammon night and several varieties of jello, rather than installing him in the Oval Office?
If you're over 60 and still get to the voting booth, how many times did you lose your glasses or car keys this morning? How many times did you forget you were looking for your glasses or car keys? Would your wife trust (let alone vote for) you as the Leader of the Free World?