In all fairness, I worked in county politics for a while. Both sides do this kind of stuff. Rove is notorious for it.
It is a dirty game.
Dammit, why didn't I think of that? It was Karl Rove that stole my neighbor's Kerry signs. Three times. And shredded them. At 3:35am. On Mondays and once Thursday because the neighbor took it in each night for three nights. And it was Rove that laughed heartily (but quietly) that last time as a Bush sign was left in replacement.
For some reason everyone blamed me.