I’m not so sure that it was such a good idea for Mark Sanford to justify not resigning as governor based on David’s retention of the Judean kingship after taking Bathsheba and having her husband killed. God, exceedingly wroth, imposed some pretty severe penalties (conveyed by Nathan the Prophet in II Samuel 12:10-14):
therefore the sword shall never depart from thine house; because thou
hast despised me, and hast taken the wife of Uriah the Hittite to be
saith the Lord, Behold, I will raise up evil against thee out of thine
own house, and I will take thy wives before thine eyes, and give them
unto thy neighbor, and he shall lie with thy wives in the sight of this
For thou didst it secretly: but I will do this thing before all Israel, and before the sun.
David said unto Nathan, I have sinned against the Lord. And Nathan said
unto David, The Lord also hath put away thy sin; thou shalt not die.
because by this deed thou hast given great occasion to the enemies of
the Lord to blaspheme, the child also that is born unto thee shall