[fightinJAG]

Question: do the superdelegates vote in public or by secret ballot?

[Cold Heat]

It happens at the convention in a series of ballots until someone wins. They can at that time switch, if necessary to put someone over the top if required. It could take days, or hours.

[SlapHappyPappy]

It’s public.

[samtheman]

Question: do the superdelegates vote in public or by secret ballot?

I don't think there are any secret ballots at a party convention.