The last bastion of white racialism: Wandering around in General Social Survey data, I found a number that was surprisingly large. It seems that an impressive 61.5% of white high school dropouts in Alabama, Mississippi, Tennessee, and Kentucky are in favor of a law banning interracial marriages.
Now, I wouldn't have been surprised at such a high number 40 years ago--the actual number averaging responses given in the 70s is 81.6%--but the revolution in racial attitudes evidently passed these folks by.
UPDATE: I'm going to have to amend this post some. I looked at the same group and was surprised again to find that 77.8% would vote for a black for president. The corresponding number for the 1970s is 57.6%.
So, these people are more comfortable, and have been more comfortable, with a black man running the country than one marrying their daughter. Perhaps many of them think a black man would help all lower-class folks.