Whatever Moore may or may not have done long ago in his past, he wasn't doing it after he married.
So even if he did those things in the past, he became a changed man.
Franken, on the other hand, kept doing what he had been doing.
When it comes to the election in Alabama, the citizens will have to vote for the person they deem less repugnant to them and will support the policies they want.
For most, they will vote for Moore as the less repugnant because of the policies such as abortion, gay marriage, etc.
Someone that supports those things (Jones) will be more repugnant than one that has not supported those things and has not expressed any predatory behavior for over 40 years (and possibly never).