Print-off some sheets of stickers with thumb-up ‘like’ and thumb-down ‘dislike’ icons. When you encounter, eg, a Tom LaBonge sign, peel-off a ‘dislike’ sticker and affix it to the sign. Do it with finesse so subsequent passersby can easily tote the totals.
Property-rights rage engendered in lawn owners? Dont worry. 1st amendment political speech rights trump virtually all other rights.