Remember back in 2007/2008 all the anti-Bush and anti-war signs you saw around? The liberals made a concerted effort to get those in peoples' yards. I know in Ann Arbor we were awash with them.
Studies have shown that when you repeatedly read something, even if it has a disclaimer that it is a lie, that you tend to remember it as a truth http://www.nytimes.com/2008/06/27/opinion/27aamodt.html So these yard sign campaigns really can be effective.
A friend of mine emailed me the picture in the post below of the sign he has had in his front yard for many weeks and suggests it is a sign EVERY Republican should have in their yard. In my condo community we are unable to post signs in our individual yards per the bylaws. So I'll do the next best thing and post it here: