Just imagine, if prisoners could vote, you'd start seeing the politicians campaigning for the prison vote. These votes would be quite valuable because it would be a very substantial voting bloc. By making them fancy promises you could get almost 100% of them voting. Meaning these scoundrels could actually sway an election.
Worst off, what promises would the politicos make to get the vote. It'd have to be better conditions, lesser judgements, extended all expense holidays etc.
Just a thought!
Brian