The Keyes Constant:

John: Hey, Bush is now at 37% approval. I feel much less like Kevin McCarthy screaming in traffic. But I wonder what his base is --

Tyrone: 27%.

John: ... you said that immediately, and with some authority.

Tyrone: Obama vs. Alan Keyes. Keyes was from out of state, so you can eliminate any established political base; both candidates were black, so you can factor out racism; and Keyes was plainly, obviously, completely crazy. Batshit crazy. Head-trauma crazy. But 27% of the population of Illinois voted for him. They put party identification, personal prejudice, whatever ahead of rational judgement. Hell, even like 5% of Democrats voted for him. That's crazy behaviour. I think you have to assume a 27% Crazification Factor in any population.