I thought Federal Judges were appointed. I'm not sure the whole political arrangement. I believe in his position he would be appointed by the Governor? If so, the Governor would want to choose someone that resembles their political viewpoint or is a member of their party. It is similar to the president administration appointments. Political powers use federal judges to "redefine" laws that they can't get pass in Congress, and this is done by appointed judges that closely align with their party.
I wonder if this Judge is listed under a certain party. I would imagine he had to play the game to get that position. His pension payment will be heavily influenced by the last position he held and its salary.