After posting I just remembered there was an incident somewhere in the country recently. Police stopped a car with some kind of anti-Obama bumper sticker and contacted the Secret Service.
Oklahoma? The guy had an ‘abort 0’ bumper sticker a month ago.
The anti-Obama sticker was confiscated by the trooper, and the Secret Service visited the man’s home to see if they could find any anti-government literature in his home. The trooper’s supervisor later mailed home the sticker with a letter of apology (according to the article).