Interesting bit of junk mail

I received an anti-school tax mailing today with no identifier other than the U.S.P.S. permit information “PRSRT. STD. Permit #370, Albany, NY”. A few minutes of searching turns up that this permit also appears on publications by:

• NY Farm Bureau
• SEIU Local 444
• Legal Aid Society of Northeastern NY
• Institute for Design Professionals
• School Span
• Project Lead The Way (various sites)
• Teamsters Local 294
• NYS Insurance Fund
• Albany Prep Charter School

and many others.

I wonder what the connection is? Are they using the same bulk mailing company?

Update 20110510 —
The local newspaper picked up on it too… Phantom Call for No Vote