Louis Woodhill has the numbers here:
Over Bush 43′s two terms in office (96 months), America lost ground with respect to full employment by an average of 94,000 jobs per month, for a total of 9.1 million positions. During Obama’s first 29 months in office, the U.S. moved an additional 6.0 million jobs away from full employment, equivalent to an average rate of 206,000 per month.
So, in terms of the rate of employment deterioration, Obama’s presidency has been more than twice as bad as George W. Bush’s. ...
In June 2011, America had 2.9 million fewer people working than when Obama was inaugurated.