I called them back after receiving many calls where they left no message at all.  Here is what their recording said:

Yoiu have reached New Partners Tele-Services - we place calls on behalf of many political and non-profit clients and organizations, etc
(Re: who called me from 1-312-985-7108)

Received a call late from 312-985-7108 no voice mail left

Rang wireline. Left No message. Disconnected before voicemail. Posted elsewhere as Democratic Party fund raiser. At very least, it is a political call.

Called me too.