Senator Smalley is taking one for the team. Once Roy Moore is elected, they will call on him to resign. When he doesnt, Democrats will claim the high moral ground just in time for the 2018 elections.
There will be more scandals from the Democrats between now and the next election. If the party of utter depravity and no moral standards tries to hilariously run as the party of virtue, it will backfire. Same thing happened to the GOP in the time leading up to the Clintoon impeachment in 1998, they ended up losing seats.