Multiple calls have come from this number. If I answer, nothing happens.

From Moveon.org websites FAQs (under Comments):  "I would like to be taken off your fundraising calling list"..."If you would prefer not to receive calls from Donor Services Group on behalf of MoveOn, please call 323-325-9114 or email DoNotCall@moveon.org."

So I called on 30OCT2015, and someone from Donor Services answered after a few minutes and at my request took me off their calling list.  If these calls don't stop, I will be posting again.

Same thing happened to me.

They have called daily for the last 2 weeks. No answer when I pick up. Frustrating that Do Not Call registry is ignored

This company calls me daily, no message, but I blocked them so it doesn't ring through any longer.