Candidate equivalencies

Hey, all my friends are doing it!

I laughed heartily when the locomotive version showed up in my in-box. Now it's made its appearance over at Pharyngula. Many other versions are on display at Fark. Well, if everyone else is doing it, how can I resist? Running with the crowd and trying to blend in is my absolute favorite thing to do. (Right.) Still, this time I couldn't resist. The real gag, of course, is the one devoted to Sister Sarah. The others are subject to more nuanced interpretations. I have some in mind. What are yours?