I usually don't pick up the phone if I don't recognize the number on my caller ID, but the area code was the same as a wildlife agency with whom I had left a message asking for help removing a woodchuck from my backyard. The caller asked for me by my first name, so assumed it was in response to my message. He then asked who I was supporting in the presidential election. After I said, "ANYONE who runs again Obama," there was a long pause and then a "OK, thank you" and a click.
I then googled OFA, and found that it stands for Obama for America. Guess they didn't get the answer they were hoping for.