What Percentage of the Congressional Black Caucus (CBC) Are Also Members of the Congressional Progressive Caucus (CPC)?

In a post last year, I noticed that a number of members of the Left-leaning Congressional Progressive Caucus (CPC) are also members of the Left-leaning Congressional Black Caucus (CBC). I was wondering how many CBC members were also CPC members and vice versa.

Using the lists of CBC members and CPC members as of 30-AUG-2011, I compared the names and tallied how many members there were in each group and how many members were common to both groups. Interestingly, most members of the Congressional Black Caucus (CBC) tend to have Left-leaning political views. The noticeable exception is Congressman Allen West of Florida, who is a former Lt. Colonel in the U.S. Army and an outspoken favorite of the Tea Party. Congressman West is the only Republican on the CBC. Although, due to racist rhetoric coming from members of the Congressional Black Caucus itself, Congressman West is apparently reconsidering his decision.

Perhaps not surprisingly, 89% of CBC members where also members of the CPC. Similarly, more than half of the CPC membership is from members of the CBC. I'd call that significant overlap.