Dick Morris breaks it down …
“By the time you finish with the various demographic groups the Democrats win, you almost have a majority in their corner. Count them:
Blacks cast 13% of the vote and Obama won them 12-1.
Latinos cast 10% and Obama carried them by 7-3.
Under 30 voters cast 19% of the vote and Obama swept them by 12-7.
Single white women cast 18% of the total vote and Obama won them by 12-6.
There is some overlap among these groups, of course, but without allowing for any, Obama won 43-17 before the first married white woman or man over 30 cast their vote. (Lets guess that if we eliminate duplication, the Obama margin would be 35-13) Having conceded these votes, Romney would have had to win over two-thirds of the rest of the vote to win. He almost did. But not quite.”