Designer/graphic artist Allison Morris does some solid political images...based in similarly solid research. Consider this one on the dollar costs related to same-sex marriage. It's a big frigging deal.
As a minor, personal illustration, I'm solemnizing a same-sex marriage here in Boston in a few weeks. That's my second SSM and fifth overall. The couple are long-time friends, one of them literally a sandbox buddy. We feel great about the occasion. Yet, they live in Florida, shall return there, and their legal marriage will have zero effect on their societal status there, their Florida or federal taxes or rights, their benefits, or other aspects of their lives. That's wrong.