thx. very interesting assuming the data is good.

first, race gap is much stronger than gender gap (see norwegianstar's link)

second, the income break-down is more sensible than what you posted earlier. in this sample of 24K exit polls, higher income people voted for romney while lower income people including so called "47%" voted for obama.

 

2011 total family income:	Total	Obama	Romney
Under $30,000	20%	63%	35%
$30,000 - $49,999	21%	57%	42%
$50,000 - $99,999	31%	46%	52%
$100,000 - $199,999	21%	44%	54%
$200,000 - $249,999	3%	47%	52%
$250,000 or more	4%	42%	55%
Sample: 24157 respondents