Campaign signs can't be forbidden in the U.S. The ACLU has made it clear that if a town tries to enforce its sign laws on your signs that are on your property, it will fight the town in court based on free speech. Therefore there is nothing anyone can do about the spammy proliferation of campaign signs placed on private property, besides complain about it on the internet. So don't tell us we should mount a campaign against it, such campaigning would go nowhere.
This is aside from the far more widespread problem of campaign signs being placed illegally on other people's property and on public property. But no one seems to want to talk about that problem for some reason. Everyone would rather fret over the far smaller percentage of signs placed legally on your own property.