I don't know the particulars of the canonical process that led to the marriage of Newt and Callista in the church.  My criticism of Cardinal Wuerl (whom I admire in most respects) is that by officiating at the ceremony he raised the profile of what I think would have  better, more appropriately been celebrated in a restrained way -- out of respect for the various persons who were hurt or harmed by their relationship. (See my post to anniec above.) Catholics are ordinarily married in a ceremony in which the pastor of the bride, or his delegate, presides. I think Cardinal Wuerl should have asked the Gingriches to follow that procedure; he could have accepted an invitation to the reception.