Newt Gingrich Signs National Organization For Marriage's Anti-Gay Marriage Pledge

Shortly after signing the Family Leader's controversial "Marriage Vow" pledge, Republican presidential candidate Newt Gingrich signed another anti-gay marriage pledge, this time from the National Organization for Marriage.

Signing the pledge means Gingrich has committed to backing a U.S. constitutional amendment against same-sex marriage and defending the Defense of Marriage Act in court. If elected president, Gingrich must also appoint judges and a U.S. attorney general who "will respect the original meaning" of the U.S. Constitution's definition of marriage as between a man and a woman, according to NOM's website.

NOM's pledge has now been signed by every major Republican presidential candidate but Ron Paul. Michele Bachmann, Mitt Romney and Rick Santorum signed the pledge back in August.

Gingrich recently came under fire from his gay half-sister Candace Gingrich-Jones for his views against gay marriage. "He is definitely on the wrong side of history when it comes to those issues," Gingrich-Jones said, adding that she is endorsing Obama in the 2012 election.