Just about every time I see a post or hear a "debate" on the issue of KY's Clerk who is now in jail, someone on the good side loves to drag out her failed marriages and try to make that an issue. You can't.
All you do when that comes up is give her and her supporters an opportunity to preach to you about their belief.
See, most Christian flavors - and most religions over all - have a strong belief in being "redeemed" or "forgiven" for past wrongs. Davis converted to her flavor of christian church after she had the affairs and divorces. In the eyes of most christians, as long as she admits that her past actions were wrong and does not do them again, those sins can't be used against her by G-d.
When some one does bring it up, she immediately tells everyone that she did wrong in the past, but found the truth and has been forgiven, just as homosexuals can be if they give up their "sinful ways".
So instead of having to defend her bad actions of the past, she gets to explain how her version of G-d is the one that should be followed and supported. This appeals to most older voters who go to church, they also believe they can be forgiven for the things they did in the past that were wrong. Putting the person who is against her on the wrong side of their view.
So what should you bring up?
How about the fact that she is an Anti-American who hates the US Constitution and wants to destroy the very document she swore and oath to defend.
Yup, see how she and hers defend that.
First she wants to destroy the Constitution because she wants to use her department of government to establish her religion as the only one that can approve who can be married. She wants to impose her religion's views as the 'right' ones and us the power of government to make all other religions toe the line with what her religion says is how it should be. Violating the First Amendment.
She also wants to overturn the Constitution to keep some citizens from having the same legal protections as others. Violating the 14th Amendment.
Only someone who hates the US and is anti-american would want to try to turn even a small rural part of the US into a theocracy.
If you don't like that argument, ask "what if a Muslim clerk refused to issue business permits for restraints that serve pork" or if a Quaker clerk refused to issue Concealed Carry Weapon permits because of her religious belief in the christian pacifist belief of nonviolence?
Just don't fall for her trap of "but i've been forgiven for my sins, and you can too if you come to church with me and get mind blanked by their clerics techniques.