Hmmmm, very interesting but I fear his age and the Demonrat liberals thinking him a traitor might be a bit risky. I could be wrong. I think he was very brave in endorsing Dubya and I would hope the Republicans can repay him in some way.
Koch was an extremely popular mayor and was able to guide NYC through a very rough economic patch in the late 70's. There are a lot in NY who still regard Hitlery as a carpetbagger. What I'm not sure of is whether or not registered Republicans can vote in Democrat primaries in NY.