I think it is actually illegal to interfere with the political signs but it is nearly impossible to convict unless the witness wants to come forward.
I too have seen my candidate's signs disappear and another candidate's sign appear in the same exact spot and also have found my candidate's signs in the bushes. Unfortunately it just has to be chalked up to overeager and maybe immature supporters and then passed over. Just pick up your candidate's sign, put it up again and go on...
and although the signs are distracting to us, Seeker1, it has become almost "mandatory" to put signs up. One candidate has said he has over 3000 signs! Seems to me this is overkill. . . .