Though I will question why just stick to the term 'gay'.
Why not a whole campaign based around a picture or Rick Perry and a 'Not <derogatory slur>'
I didn't read the last couple of pages either, but just to hazard a guess, perhaps because A. "Gay" is not a derogatory slur, B. Rick Perry doesn't base his politicking around the effort to deny other <derogatory slur> groups equal rights, C. Perry could not plausibly be construed to be, say, a closeted black person or Mexican, and D. while overt racism is highly unlikely to be concealing secret blackness, overt homophobia is highly likely to be concealing secret homosexuality.