Romney bumper sticker and yard sign, but I had to go all the way to the Wisc State Fair to see them, and even then it was merely at the GOP's booth at the fair. I also encountered my first Romney supporter, or at least one who supports him enough to buy a button from the booth and wear it. She was kinda hateful too (big surprise <#include sarcasm.h>).
A lady I know who lives in Wisc said she's seen several Romney bumper stickers, though. :(