It sounds like a lot, but it ends up not being much. It was, of course, 40k votes over 3 states. But most Presidential elections the winner carries more than 320 electoral votes. Bush 2 had pretty slim margins, of course. Before that, you need to go back to Carter to get 297 electoral votes.

It's not the tightest margin, but it's among the lowest margin of victories in the electoral college. Not that it matters, because you either win or lose. And we all know the rules of the game before we start playing