I am not a Roman Catholic, however I know many who have left the RC church. Divorce and adultery are biggies for them and have always been curious how the Gingrich's managed to get their marriage blessed. Have they ever said?
It is by no means an easy process to straighten out three marriages. The Church has very advanced procedures to examine each and every aspect of the prior marriages. It particularly becomes a super-serious issue if the prior marriage was made in a Christian union, whether Catholic or not. It gets a bit easier if they were civil marriages. I have no idea what the Gingrich circumstances were, nor am I a canon lawyer. But it certainly appears that a duly constituted Church court has ruled on the issues. And, as I said, that’s good enough for me.