We are regular contributors to our political party on every level- national, state and local. Plus we regularly contribute to our local congressman’s campaigns. We rarely get phone solicitations from politicians, but when we do we tell them in rather unpleasant terms that we do not accept telephone solicitations and we ask to be removed from their list. This seems to work.
Nothing seems to even slow the endless E-mail solicitations, but they are easy to dump, so no real problem.