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@GraniteGeek Yeah the “disentangling their effect from other factors” is kinda what I was getting into; you can’t, really. Yard signs affect canvassing and social media posting. Heck, I think I’ve even seen some appear in TV ads in the background.
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@GraniteGeek btw, an additional anecdote: my mom was reminded to pick up her absentee ballot for this September’s primary by seeing a @CindeWarmington yard sign. (I would have reminded her anyways, but the yard sign got to her first)