In 55 of the last 56 Presidential elections, a black candidate did not win the Presidential election. Obama is facing some steep odds.
But in all the last 56 elections, a Mormon has never won.
Candidates who are not white Protestants have won very few elections for President or Vice President, and that trend must continue this election. Every ticket that has ever been re-elected had 2 white Protestants, and every ticket that ever defeated an incumbent President had 2 white Protestants. Therefore, the winning ticket this year must have 2 white Protestants.