I was looking at Mississippi's electoral map. I noticed that the percent of African-Americans had a close roughly 1:1 correlation with the % of votes in the county cast for Hillary Clinton. The correlation exists in Alabama, but it is not as strong. What is the correlation between a MS county and the percent of votes for Hillary Clinton?
For example, the state is 40% H.Clinton and 37% African-American. The AA number is from the 2010 census.