My understanding is that criminal sanctions would only apply if the candidate can be shown to have engaged in election fraud. I doubt that any of the candidates are not 100% insulated.
If, however, an election result is proven to have been obtained through fraud, a "successful" candidate can lose the office to which they were fraudulently elected. Elections are largely governed by state law, so ultimately it comes down to the specifics of Florida legislation/regulation and any time limits for certifying/contesting results that might apply.