Constitutionally it ought to be left to the states to choose. Also you’re one of the special few who would vote Republican; most of the folks who had been your cellmates would go overwhelmingly Rat. I think the Rats want to even open it up to parolees and probationers, anyone who isn’t physically in a prison or jail.
I don''t think so. I saw a study somewhere (wish I had saved it) that said that the proportion of D voters was somewhere in the range of 60 - 80% (my best recollection of the results). The proportion of R voters was rather larger than I would have expected.