I've been doing that for months and still get call.

Either contact your telecommunications provider for assistance with blocking the calls or invest in a device which can be programmed to automatically reject unwanted calls. We subscribe to a call blocking service through our ISP--and it is worth EVERY penny.

[***] called last nite at 5:30, CID says research center. Machine picked up call, then they hung up. Did not call back.  We'll see what tonite brings tho!!  Find these [***] and kill them !!!!!!!!!!!!!!!!!!!!!

I've participated in phone canvassing for the Democratic party. It is never done the way you described. Democrats are instructed to identify the party and on who's behalf they are making the call. Also, in almost all cases, both parties use professional firms to do their surveys. And, if you ask  surveyors to identify who they are calling for, they are  bound by law to tell you. Are you sure the call wasn't from the Republican campaign, using reverse psychology, to get you to dislike the opponent? Hmm! I wonder. Or, the call just might be part of a scam that we haven't figured out, yet.

I too got a call from Research Center 586-200-0081. I didn't answer.