Who called from 5072087170

Unwanted call.  Who is this?

Just got a call from this number. I didn't answer because I didn't recognize the number. They did not leave a message. I tried calling back and got a busy number. May just block the number.

Unwanted call - they did not leave a message and I did not attempt to return a call.  Who is this?

I also got a call from this number. I missed it but they left no message.  Because of so many people getting calls right now (early 2016) I am thinking it MAY be some political campaign since the caucuses in MN are in a month. Do people that are receiving these calls have MN are codes? If we confirm that many have MN area codes who receive this call, then I would guess it's a campaign.

Received call from this number on my cell.  Live in NW Minnesota.