Liberal Unpopularity

Kevin Drum remarks a bit on the perennial unpopularity of self-identifying as a "liberal" no matter how popular liberal policies may or may not be. I now can't find the link, but I think one of the most telling pieces of data I ever saw on this was something that broke ideological self-identification down by race. Self-identifying as a liberal turned out to be less popular among African-Americans than it is among white Americans. This even though everyone knows that African-Americans are much more likely to vote for Democratic candidates and have more left-wing views than white people on most issues.