One way to build support to encourage Mayor Bloomberg to run is to post on various forums urging support and showing how he is better qualified because of his experience than others. the Main Stream Media will be making efforts to discredit the Republicans so more effort should be spent on the Democrats who happen to be less qualified in terms of experience than any of the other candidates.
there are quite a few topix forums such as http://www.topix.net/forum/state/ca
Registering on one registers the user on many forums. search engines can be used to find individual forums using a state or city name followed by the "forum".
http:///www.freerepublic.com
is a good place to post copies of his speeches, etc.
Some newspapers such as the Washington Post, N.Y. Times etc allow comments on news stories and editorials.
Hey Martha is another access point for various local forums
http://community.cnhi.com/eve
I'll provide some other forums later.