Received this on Facebook. Clicked through and found that a guy named Ben Dreyfuss posted it on Mother Jones. He added the following note:
The Southern Poverty Law Center posted this cartoon to its Facebook page. The credit reads CagleCartoons.com but I can't actually find it on there. I'll update with proper credit when I figure it out. Safe to say, this is amazing.
Please let me know if you find out the source.
Thought some people would want to share it:
UPDATE: Just noticed the MJ link refers to the image as: "the-gays-won-the-civil-war"
UPDATE: Trix did a Google Image search and came up with the following image, credited to Bob Englehart: