I know it's almost four more years until the next presidential election. But this past year I stumbled on a very effective way to end the campain calls...
1.) Get the name of the telemarketer that called you.
2.) Ask if they would appreciate a donation.
3.) Get the name and contact information for the campain fund manager.
4.) Let them know if you get another call from them, you'll be making a donation to the competition with a carbon copy to their office and a letter explaining why.
End of phone calls.^