One of the things I daydream about doing if I were elected Supreme Tyrant is putting a law into place that forces political campaigns to clean up their signs promptly.
Perhaps after five days had passed since the election, people could turn in abandoned signs for $1, and the campaign that placed the sign would then be fined $1.50 and 1 vote.
Now we just need a way to make sure people can't forge signs of their opponent's campaigns, or steal them to turn in late. Or maybe we should encourage them to steal each other's signs. That'd mean fewer signs to look at.