The inference being that the White electors had become tolerant and anti-racist over that time span. In fact the explanation is that the White electors have been replaced and displaced. I don't have the figures to hand but according to Amren non-Hispanic Whites, who comprised about two thirds of the population in the mid-eighties now comprise a bare majority. Same reason Detroit politics has been dominated in recent times by blacks. In 1950 the electorate was 85% White, now it's 90% black. So CNN panel the explanation lies not in a Pauline conversion of Whites to diversity and multiculturalism. In fact we can safely assume any change in outlook will be in the opposite direction.