I don’t know... they risk a lot if they’re doing that. The pics might give ‘demonstration effect’ for union members (not only SEIU members) who are on the fence. The SEIU leaderships are clearly for the Dhim.
http://michellemalkin.com/2010/01/13/seiu-affiliated-union-endorses-scott-brown/
and
http://hotair.com/archives/2010/01/14/police-unions-endorse-brown-over-ag-coakley/
One of them is even the union Coakley’s HUSBAND belongs to - Sweeeettt