“The proposition to make soldiers of our slaves is the most pernicious idea that has been suggested since the war began. It is to me a source of deep mortification and regret to see the name of that good and great man and soldier, General R. E. Lee, given as authority for such a policy. My first hour of despondency will be the one in which that policy shall be adopted. You cannot make soldiers of slaves, nor slaves of soldiers.” –Howell Cobb, former governor of Georgia

Identify a potential point of bias in the source quotation given above.