In response to this, especially the last paragraph:

If your main/only reason for voting against same-sex marriage is religious beliefs--specifically that marriage is between a man and a woman--you are, in fact, violating the first Amendment to the Constitution:

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

Religion should have nothing to do with a Civil marriage. If you don't want a same-sex couple marrying in your church, fine. Couples can take their money elsewhere.