Nobody ever can or should be mandated to perform a religious act -- including officiating at a wedding. Want proof? Ask most Rabbis about doing an interfaith marriage. So, these conservatives who have planned to defy SCOTUS on DOMA are within their theological right (and rites) to refuse. However, there are thousands and thousands of clergy who feel that our religious rights (and rites) have been inhibited by DOMA and laws that limit the legal implications of the marriages we have performed between same sex couples. Today is a clear victory for religious freedom as it maintains the rights of clergy who say 'I Don't' to gay marriage, but liberates those of us who say 'I do.'
Measuring racism is not always a clear dichotomy. Not every attitude or word spoken is either clearly "racist" or "not-racist," to put this another way. There is a spectrum. The good news is that the spectrum shifts over time. What was once considered acceptable becomes taboo. Attitudes shift, even if it takes generations.