“1” may be subject to local codes, esp. if close to street or road, depending on how repressive your area is. But, election signs might be exempt?
Actually anybody can place sign on public property in AZ during election time. That’s the law! There are many signs of all other candidates there, Republican and Democrats, even Biden, and they generally last. Only Trump is doomed. Private property of course needs owner approval, but owner approved signs are disappearing from private properties too.
Az qualifies stealing signs as misdemeanor or even felony in cases like this. Stealing them can get you in jail!
But the police is too busy nowadays, pictures were taken and submitted, they are investigating. Apparently they arrested somebody, but that guy was an idiot, probably just random jerk. The main force seems organized, clever and methodical. Watched signs do not disappear, but who can spend all nights watching signs?