I didn't answer when they called, and they left a message asking if I support Romney or Obama

Ive gotten 5 today and now another one is calling from a 612-807

This is a company doing elections polling.  Polling is exempt from do not call lists.  Regardless of what candidate, party or issues you support, they are most likely a neutral polling company ? even if they only ask Obama-related questions.  Information from polls helps candidates decide where to focus their efforts.  I hate random calls as much as everyone else, but I will happily spend 30 seconds answering three questions.

(They called me several times, and when I answered they asked if I supported Obama or Romney, how much I support him, and if I felt that Obama's economic policies have improved my life over the past four years. Of course, the answer was yes.)

This company has called me numerous times. They just want to know how much you like Barrack Obama.

They never called the home phone, but called the cell. I just added them to my blacklist. Since TMobile wont block, I installed Call Control for Android. Works wonders. I just hear a little beep when one of the calls I have on my black list tries to get through.

They have called me 3 times in 2 days.  I just "ignore" the call.

They claim to be RDI, a survey co.

I have received 3 calls in the last two days, they call and hang up.  I am also on the do not call registry.  How can you get this stopped?

Caller ID: Minneapolis MN
Called number back and message says: "You have been contacted for marketing research or a sales call." I am on the "Do Not Call List." They also call from 612-326-4344 and when I call back I get the same message. You cannot leave them a message. The above message just repeats itself.