The dems probably pulled the same trick as they did down here (The Woodlands TX). A lot of houses have Bush yard signs, but we woke up last week to find Kerry signs all over the neighborhood, a lot of times right at the edge of the road, but still on our land. We, of course, pulled out the Kerry sign on our land, as did a lot of our neighbors. On Sunday I saw a letter to the editor complaining that the evil Right was pulling up Kerry signs. No context to the fact that the Kerry signs were put up on private property right in front of existing Bush signs.
Sounds like the "when did you stop beating your wife" strategy.