This would be a good tactic, signs carried by conservatives who look somewhat "Democrat" or "liberal". Would convey the image of a disgruntled Obama supporter. I think it would be good psy war tactics, and reach those wavering, uninformed middle ground people who foolishly voted for him last year, but now have second thoughts. We can start the long road of peeling off more and more votes from that guy for the midterms next year. All we need is something like 10-15% away from his camp.
Sounds like a good idea to me. FWIW, my brother-in-law, who I used to think was a standup guy, voted for Duh!1, expressed remorse the day after, and then went full-bore MoonBat, replacing all the bumper stickers on his SUV with even more, and bigger, ones.
I suspect that for every Mo'Bot who has buyer's remorse there will be another one just like him, perpetually defending what he secretly fears was the most stupid decision of his life.