They did not leave a message.  I called the number back.  The messages says they are Gateway Communications calling on behalf of a local charity I have supported in the past.

Called saying they are from the Portland Mission asking for cash donations for their food bank. I told them we do not give out our credit card info over the phone. They had my mailing address already so they are sending a donation letter to me that way. Not sure how they got my unlisted phone number, but they knew my name. I have donated to Portland Missions during the Holiday season....so?