Greensboro blogger David Wharton, a Catholic, has decided to defy his bishop's endorsement of Amendment One for a very specific reason – he feels that endorsing the amendment is a violation of the Second Vatican Council's Declaration on Religious Freedom Dignitatis Humanae:
After due consideration, I've come to the conclusion that Bishop Jugis is wrong to support the amendment.
The Church holds that marriage is a sacramental, lifelong union between one man and one woman, founded in the love between the partners and for the procreation of children; however, it blesses sacramental marriages between infertile and post-fertile opposite sex couples. Thus its position is prima facie contradictory, but let that lie for now.
Even granting the Church's definition of marriage, I believe Bishop Jugis's endorsement of Amendment One violates the Second Vatican Council's Declaration on Religious Freedom Dignitatis Humanae. Here are some excerpts from that document, with the most relevant language highlighted by me. Pardon the length.
Despite the length of the post it's worth reading.