Jane Pitt, Brad Pitt

Brad Pitt's mother Jane has written an anti-Obama, anti-gay letter in support of Presidential hopeful Mitt Romney.

"Any Christian who does not vote or writes in a name is casting a vote for Romney's opponent, Barack Hussein Obama — a man who sat in Jeremiah Wright's church for years, did not hold a public ceremony to mark the National Day of Prayer, and is a liberal who supports the killing of unborn babies and same-sex marriage," she states in The Springfield News-Leader.

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The open letter was written in response to another opinion piece that justified Christians' rights to refuse to vote for Romney because he's Mormon.

"I am also a Christian and differ with the Mormon religion," Pitt writes. "But I think any Christian should spend much time in prayer before refusing to vote for a family man with high morals, business experience, who is against abortion, and shares Christian conviction concerning homosexuality just because he is a Mormon."

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While Brad has yet to comment on the letter — an email to his rep was not returned — the actor has been vocal about his support for gay marriage.

"When someone asked me why Angie and I don't get married, I replied, 'Maybe we'll get married when it's legal for everyone else.'" Pitt told Parade magazine in 2009. "I stand by that, although I took a lot of flak for saying it — hate mail from religious groups. I believe everyone should have the same rights."