Remember this is Louisiana. Senator David Vitter, from the same state, got caught cavorting with prostitutes (he's married as well) and was reelected on a family-values platform. What is it with Louisiana?
” What is it with Louisiana? “:
It is possibly due to their French social/historical component - French are somewhat more tolerant of infidelity.
Ever since the French Revolution they have rejected most sexual restrictions, including incest. Incest was just made illegal a year or two ago, IIRC.