African-American quarterbacks face more pressure and more criticism than their white counterparts, Philadelphia Eagles QB Donovan McNabb says in an interview scheduled to air on HBO on Tuesday night. McNabb, in an interview on "Real Sports with Bryant Gumbel," tells interviewer James Brown that African-American quarterbacks such as himself face added pressure because there are fewer black QBs -- and because some still don't want black athletes playing the position. "There's not that many African-American quarterbacks, so we have to do a little bit extra," McNabb tells HBO. "Because the percentage of us playing this position, which people didn't want us to play ... is low, so we do a little extra."