Comment: I spoke with the Florida State Board of Elections.

(See in situ)

In reply to comment: Florida (see in situ)

I spoke with the Florida State Board of Elections.

They told me January 3rd is the deadline to register or switch party affiliation in order to vote in the January 31st Republican primary. But December 29th would be even better, of course. It is always good to be on the safe side with this kind of thing. Thanks!