Rep. Michele Bachmann (R-Minn.) gestures as she speaks at the Republican National Convention in St. Paul, Minn., on Sept. 2, 2008. (Paul Sancya/AP)

The Family Leader has apologized for including a passage in the pledge that seemed to insinuate blacks were better off under slavery than they are today.

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Thursday night, Michele Bachmann became the the first presidential candidate to sign a pledge by the Family Leader, an influential social-conservative group in Iowa, that says pornography should be banned and homosexuality is a choice.

By signing the pledge, “The Marriage Vow – A Declaration of Dependence upon Marriage and Family,” Bachmann vows to “uphold the institution of marriage as only between one man and one woman,” Think Progress reports.

To uphold the institution of marriage, the pledge states the following:

1. All forms of pornography should be banned.

2. Homosexuality is a choice, a health risk, and can be compared to polygamy or adultery.

3. Sex is better after marriage.

4. Sharia law should be rejected.

5. Better protection for women against prostitution and trafficking.

The pledge also states:

Slavery had a disastrous impact on African-American families, yet sadly a child born into slavery in 1860 was more likely to be raised by his mother and father in a two-parent household than was an African-American baby born after the election of the USA’s first African-American President.

Writer and comedian Baratunde writes of the statement: “It's as if these people held a Focus Group Of The Sheltered asking ‘List everything you know that's black’ and came back with ‘slavery’ and ‘the president’... to invoke slavery in ‘defense’ of marriage exposes a complete lack of historical understanding and common sense, much less sensitivity.”

Family Leader CEO Bob Vander Plaats, a conservative evangelical leader who previously was state chairman of Republican Mike Huckabee’s presidential campaign, said the Family Leader would not support any candidate who doesn’t sign the pledge, according to Iowa Caucuses. The way things are going, Bachmann may be the only candidate the Family Leader supports.

An aide to to former Republican Utah Gov. Jon Huntsman has said Huntsman never signs pledges. A spokesman for U.S. Rep. Ron Paul, (R.-Texas), said the congressman has reservations. Former Republican Minnesota Gov. Tim Pawlenty is reviewing the pledge.

The pledge asks for the following commitments from its signers: personal fidelity to his or her spouse, opposition to any redefinition of marriage, prompt reform of uneconomic and anti-marriage aspects of welfare policy, tax policy and divorce law, and an understanding that “robust childrearing and reproduction is beneficial to U.S. demographic, economic, strategic and actuarial health and security,” among other commitments.

Alice Stewart, a Bachmann aide, said the congresswoman did not hesitate to sign the pledge. “She has been married for over 30 years and has a strong marriage and faith,” Stewart said.