::::(Disclosure: I am the photographer, BTW) It is a very extreme expression of sentiment indeed.  It should not be excluded because it makes pro-lifers, Obama, or anyone else look bad.  It should be appraised for its interest and its informational value.  I think it has both.  Best of all, I think it's something that most people, no matter what their politics, would remember seeing.  It's not boring.  I support its inclusion.