We don’t know if the multiple marriages the woman in the Bible had were after divorce or if she was a bigamist. Remember, the Bible does give guidelines where divorce is accepted (Deuteronomy, 24:1). We have no idea Rush’s circumstances regarding his divorces as we don’t most other people’s.
How about Larry King? He has his 7th divorce coming because he slept around with his wife’s sister, who is 50!