it would not be surprising to find out if Joe's handlers have been using the Presidential "robo-signer" to sign bills. If you don't know, the "robo-signer" is a special machine that writes an exact copy of the President's signature, traditionally used for campaign letters and memorabilia autographs, but Obama was the 1st President to use the "robo-signer" to sign actual bills because he felt too busy.
