I was surprised to learn that the President "authorized use of an autopen" to sign the law extending the life of the USA PATRIOT before the midnight deadline that would have caused the law to lapse. [Special Bonus Points to anyone who -- without checking Google or elsewhere -- can list the full title of the law that has that catchy acronym.]
After all, this was the President who took the oath of office twice to be sure that no one could challenge his presidency on that point.
It turns out that the legal counsel for President Bush prepared a formal memorandum allowing such signatures in 2005. I guess that proves that White House lawyers know how to make things easy for the President.