Mystery Solved. These calls are NOT coming from The Heritage Foundation. They almost certainly originate from telemarketer The Heritage COMPANY. http://www.theheritagecompany.com/
This is Heritage Foundation. They are a Conservative Group who take on the administration on the air & in the courts. They promote conservatives,(different than republicans). If You are a conservative this group is really worth supporting.
Doubt that - Both Heritage and Rush are died-in-the-wool, unapologetic conservative right on the spectrum.
Appears the liberal left has found a new way to battle ... swearing and lying isn't working. Don't know about Rush ( doubt he'd have a simple phone number other than the one he uses ) but Heritage WILL answer their REAL phone numbers: they're legitimate.