Christopher B. Duncan is an American actor. He is best known for portraying Braxton P. Hartnabrig on The Jamie Foxx Show and he is also known for playing President Barack Obama on The Tonight Show with Jay Leno.  He portrayed Obama in the 2010 film My Name is Khan as well. Duncan received his B.F.A. from the University of Colorado, Boulder. In addition to Braxton P. Hartnabrig, he also portrayed Spyro in Original Gangstas and starred in two Craig T. Nelson television shows: The District and Coach. In addition, he portrayed Clarence Wiedman on…