There are some ways in which I like Bloomberg, but he is playing very close to the national GOP. He has been doing a number of major fundrasisers for national GOP leaders. See http://www.observer.com/pages/story.asp?ID=7277 http://www.politicsnj.com/kornacki120402_rove.htm
Admittedly, the nonpartisan elections has as much to do with Bloomberg's bizarre alliance with Lenora Fulani and the Independence Party.
It's often too easy to look purely at the local coalitions that make particular campaigns possible, while ignoring the national strategy pushing them forward. This push by the GOP to heighten partisanship in their strongholds while talking "nonpartisan" in places like NYC and California is too clear not to take seriously as explicit strategy.
-- Nathan