Newt takes no-adultery pledge By ALEXANDER BURNS | 12/12/11 1:09 PM EST When the Iowa social conservative group The Family Leader unveiled a sweeping pledge on marriage and abortion over the summer, Newt Gingrich was one of the candidates who passed on signing it. Now, Gingrich has answered the pledge with a lengthy written response, vowing to support a federal marriage amendment, reinstate the Mexico City policy -- and, per the stipulations of The Family Leader pledge, to be faithful to his wife: I also pledge to uphold the institution of marriage through personal fidelity to my spouse and respect...