Speaking of nonscientific polls, let's mention Gallup.

They've got a peculiar formula for likely voters, that results in the following
predicted voting demographics:
Total Weighted Sample: 557 Likely Voters
(2000 exit poll actual results in parentheses)
Conservative: 41% (29%)
Moderate: 41% (50%)
Liberal: 18% (20%)
GOP: 39% (35%)
Dem: 35% (39%)
Ind: 25% (27%)
Over $75,000: 32% (28%)
$50-75,000: 16% (25%)
$30-50,000: 26% (24%)
$20-30,000: 11%
Under $20K: 9%
White: 85% (81%)
NonWhite: 15% (19%)
Black: (a subset of NonWhite) 8% (10%)