Mystery Solved. These calls are NOT coming from The Heritage Foundation. They almost certainly originate from telemarketer The Heritage COMPANY. http://www.theheritagecompany.com/
I called the HQ of Heritage Foundation and was connected to their membership department. They verified that the 323 330 1426 number IS one of theirs. The representative was very apoligetic and said she would take my name off their call list. I told her I was suprised that the number was one of theirs because I had a much higher opinion of the Heritage Foundation and their professionalism. I'll wait now to see if I get another call.