The following description is sourced from Wikipedia (http://en.wikipedia.org/wiki/Jack_Johnson_(boxer))
There have been recurring proposals to grant Johnson a posthumous presidential pardon. A bill requesting President George W. Bush to pardon Johnson in 2008, passed the House, but failed to pass in the Senate. In April 2009, Senator John McCain, along with Representative Peter King, filmmaker Ken Burns and Johnson's great-niece, Linda Haywood, requested a presidential pardon for Johnson from President Barack Obama. On July 29, 2009, Congress passed a resolution calling on President Obama to issue a pardon.