Focus Groups

I just saw the CNN Ohio focus group and as in the other debates, there seems to be a disproportionately high percentage of African Americans in the group. At various times they've made up 25 to 40 percent of group members. Are we really to believe that 25 to 40 percent of undecideds are African American? And this is when most polls show the black vote for Bush is statistically indisguishable from zero?