I don't know how familiar you are with the history of the United States. And I don't know if any of our fellow hubbers work for a national polling agency (How much do polls tell you anyway?). I don't mean to deflect your question in any way, but it seems to me that such a question cannot be approached sensibly without being mindful of at least some post-Civil War history, to see how race affects public policy.
Now, many scholars will tell you that in many ways -- politically, socially, culturally, religiously -- the ruling classes of the southeastern United States never stopped fighting the Civil War. To take one example of this, one reason that we, in the United States, do NOT have universal health insurance, like you guys in England and Europe and other places is because of race.
President Harry Truman proposed it back in 1946. It was blocked by southern Democrats, who (along with their constituents) feared that this would lead to integrated hospitals. At this time the southeastern and western regions of the country were much poorer than the northeast and midwest, for certain historical reasons. The south was willing to go along with Democrat Franklin Roosevelt's New Deal because they desperately needed, as a region, to improve the standard of living, and so forth.
But they were willing to go only so far! Barack Obama is the leader of the Democratic party (this is the party that had been the socially reactionary party/Republicans had been the socially progressive party from about 1850 to perhaps, in some ways, up to the 1970s (believe it or not the 1972 Republican Presidential campaign platform actually criticized corporations for going overseas to look for cheaper, more exploitable labor). There was an amazing ideological swap between the Republican/Democratic parties.
Not only was universal healthcare blocked because of race, but so were a host of other progressive reforms blocked by Southern Democrats, largely, from Truman to perhaps Carter in the 1970s, based on social implications these reactionaries feared. When Representative Joe Wilson (Republican from South Carolina) shouted out, "You lie," to President Obama when he gave his first State of the
Union address, we have to see that as the regional legacy of the south popping up in certain ways.
And so on and so forth. Etc, etc.