To be honest, I have no idea how effective this would be. It depends, like all things, on the participation.
Have enough people ordering a free sticker, the more it will cost Moveon.org and Presente.org.
As far as I could tell, I entered two different names with two different emails but kept the mailing address the same and it accepted both. So hopefully, two free stickers are on their way and will go right into my burn barrel.
I'll have to look up a few more older addresses and enter those as well.