Political Crank Calls

Why is it that the political cranks aren't subject to the Do Not Call List? I'm getting sick of getting calls from the Corker campaign. Especially those ones taped by his wife. She sounds like she's trying out to be a phone sex operator. Word to the political campaign workers out there: if you're gonna call my house, at least have the guts to talk to me live otherwise you won't be getting my vote.