Moments ago, Democrats representing Florida in Congress released this joint statement, effectively putting the kibosh on a mail-in re-do primary:

"We are committed to working with the DNC, the Florida State Democratic party, our Democratic leaders in Florida, and our two candidates to reach an expedited solution that ensures our 210 delegates are seated. Our House delegation is opposed to a mail-in campaign or any redo of any kind.”

Even if the candidates agree, there will be no expedited solution unless the courts somehow intervene, which, given a series of federal court rulings last year, is unlikely.