I forget who said it, but the paraphrase goes something like this, "Anyone who desires to run for public office should be prevented from doing so." -- Douglas Adams, I think? Or maybe it's the reverse -- I'm not finding it right now. It was about the time that Zaphod Beeblebrox explained why he had two heads, I think. Not the Young Zaphod Plays It Safe story, though.
Or, I could be completely wrong, and made it up myself. Though I doubt it -- I'm sure I'm not the first person to have had the sentiment.
Mark Twain, perhaps...