Yes, the minimum wage causes unemployment

Some math from the Political Calculations blog:

In terms of jobs lost, that means that 2,234,383 of the jobs lost in the U.S. economy since 2006 have been jobs that were directly impacted by the series of minimum wage increases that were mandated by the federal government in 2007, 2008 and 2009.

Interestingly, the average number of employed members of the civilian labor force in 2006 was 144,427,000. In 2010, the average number of employed members of the civilian labor force in the U.S. was 5,363,000 less, standing at 139,064,000.

So, in percentage terms of the change in total employment level from 2006 to 2010, jobs affected by the federal minimum wage hikes of 2007, 2008 and 2009 account for 41.8% of the total reduction in jobs seen since 2006.