I guess with this, we can officially say that all the conservative support that JBE got was "I'll vote democrat just this once because Vitter deserves to go to Hell" support, rather than any sort of permanent gain for the democratic party.
I will have to disagree. Vitter's affairs had been out in the open for years beforehand, and besides Trump has way more baggage, so there was more at work.
IIRC the prostitution was an issue in 2010, but he still won against a strong opponent because
a. It was 2010, and
b. It was a federal race.