If you have a sign posted on your door reading "NO PEDDLERS OR SOLICITORS", then any peddler or solicitor who rings your doorbell is trespassing.
The mass marketeers are going into the clubs, religious organizations and public interest groups that folks belong to. They get the executives -- one or two, eventually a majority of the excutive committee or whatever the master steering group is to to all things necessary -- from providing solicitation lists to changing by-laws -- so as to allow the marketeers to call YOU. YOU, the member of a club, church, sect, synagogue, or organization.
You see, as a member of club, the FIRST AMENDMENT'S guarentee of the right of free association PREVENTS any goobermint [sic] body from stopping that kind of marketing.
Marketng is like sex. You just can't avoid it. An intrinsic part of nature.