GOP frontrunner Newt Gingrich has signed a pledge from The Family Leader, an Iowa social conservative group, that forbids committing adultery, according to the political blog The Iowa Republican.
Gingrich has admitted to committing adultery in the past, including the period of time when he was calling for President Clinton's impeachment over the Monica Lewinsky sex scandal.
The pledge has already been signed by Texas Governor Rick Perry, Rep. Michelle Bachmann (R-MN) and Rick Santorum. Former Massachusetts Governor Mitt Romney and Rep. Ron Paul (R-TX) have said they would not sign the pledge.
Gingrich chose to sign today after initially declining to do so in August, when the text of the pledge claimed that African-American children were better off under slavery than they are today. That text has since been removed. He also vowed to uphold The Defense of Marriage Act (DOMA), which prohibits same-sex marriage.