call came in on my business line, I answered "This is [my first name, last name]". Hung up on me.

I tried calling this number back a few times and I only get a busy signal.
Something is not right, whatever it is it can't be legitimate.

Hangup call. Dialed it bak. V-mail said "You have reached the campaign number. Press 9 to be added to our do not call list." Seems sketchy.

Robo calls are illegal. Hang up calls are illegal. Report by using: http://www.fcc.gov/complaints

Received the call but no voice mail was left. Caller ID said Missouri call. If it is political, they are exempt from the Do Not Call list. Check out the Do Not Call website for info on exemptions. Rather annoying. Politicians aren't going to pass something like Do Not Call unless they are exempt.

I talked to someone when I filed a complaint against a telemarketer (Card Services) and he said to NEVER press any numbers because that flags that the number is active. Now they tell me. He also said that the computers are making calls just going from number to next number without regard for DNC list. They are computers and programmed that way. It's become a big problem.