The federal Telephone Consumer Protection Act of 1991 (TCPA) regulates automated calls.[12] All robocalls, irrespective of whether they are political in nature, must do two things to be considered legal. *********Federal law requires all telephone calls using pre-recorded messages to identify who is initiating the calls and include a telephone number or address whereby the initiator can be reached.[13]**********
Some states (23 according to DMNews) have laws that regulate or prohibit political robocalls.[14] Indiana and North Dakota prohibit automated political calls.[15] In New Hampshire, political robocalls are allowed, except when the recipient is in the National Do Not Call Registry.[16] Many states require the disclosure of who paid for the call, often requiring such notice be recorded in the candidate's own voice. The patch-work of state laws regulating political robocalls has created problems for national campaigns.[17]
For more INTERESTING info : http://en.m.wikipedia.org/wiki/Robocall#Political_calls
After getting this call but was hung up on, I called them back and I could press 2 if I wanted to be added to the do not call list. No mention of any company ever.