My MIL had one.....actually it said "No solicitors or religious fanatics".
She took it down about the 10th time some little kid came to the door selling magazines or candy bars for school or Little League, oh, and the guy running for the City Council pointed out he was neither a solicitor or a religious fanatic!
Our sheriff's department did a big campaign about 6 months ago saying that 'No legitimate business in this internet age sends salespeople door to door". I keep a copy of that by the front door, but haven't had a chance to show it to anyone recently.
Since my 19 year old registered to vote last year she has been bombarded with weekly phone calls, and people at the door about once a month encouraging her to vote by mail. A certain political party is really pushing this, apparently because registered members of this party pretty much stay away from the polls for midterm elections, and that party could lose control of the House and Senate this November.