People have their beliefs and affiliations, and will whether or not you allow them to be officially members of a Party.
I think facing elections and stating your affiliations openly is the most transparent and democratic way to do it.
Again, I believe in expanding the voting base beyond the RA, too, which would soften the impact of party-based block voting of all kinds.
In RL maybe, upcoming elections will sway a judge to pander to the voters in a profoundly negative way.
If we ever faced a situation where there were enough engaged voters paying close enough attention to the court in order to influence the behavior of a judge, that would probably be a very good thing for TNP.