2013-03-16T161800Z_01_JME107_RTRIDSP_3_USA-REPUBLICANS-CPAC-8500 Ben Carson. (Reuters)

Facing a backlash over his comments on gay marriage, surgeon Ben Carson accused white liberal critics of racism.

"They're the most racist people there are," Carson told radio host Mark Levin on Monday. "Because they put you in a little category, a box: 'You have to think this way, how could you dare come off the plantation?'"