Ya know what? Some times it just doesn't work out. Their actions either for or against gay marriage have nothing to do with this. I suspect nearly everyone goes into a marriage thinking "This is THE one!" People change; needs change. 

Seriously - acting as if this is some great act of hypocrisy is dishonest. If one of them was caught en flagrante with someone else of either gender...well...it's still just a divorce and the schadenfreude is a bit inappropriate.