Received a call from the same number with the location as Rochester, MN. I called the number back during non business hours ( 1:00 a.m. CT) and got a recording saying "Hi, you've reached the Fundraising Center....". I didn't listen to the whole message, but I did some simple google searches and saw that Bernie Sanders campaign team is having (or had) a brunch and town meeting (fundraiser) in Rochester, MN, so it may be a part of that.