Today, the Service Employees International Union (SEIU) began running an ad for Barack Obama in the Pennsylvania primary. Obama has previously welcomed this endorsement.
Why is this endorsement of interest? Just this past weekend, the SEIU sent hundreds of "members" to disrupt a labor conference in Michigan. They were apparently shoving people to the ground and apparently even went so far as to inflict a head wound on a retired woman (story here, video). In California, they are stalking nurses in a rival union by going to their homes with cameras -- and even made a YouTube video of themselves doing it.
A California judge even issued a restraining order against them.
So the question is, wIll Obama repudiate these violent tactics -- and reject their ads? I wouldn't hold my breath...