I think it's for a political campaigne

who is it

http://www.dpflynt.com/

I keep getting calls from this number that I have no idea who it might be. Is there any way I can block this number from calling me on my cell or landline?
When I called back there was a recording about a company called 'target communication.'

I keep getting calls on my voicemail, what can I do about these calls?