Even in his response, Clinton is dismissing Obama and doing so using race. For example, he says that he understands why the “African-American” community is proud of Obama and supporting him; however, he is conveniently ignoring the fact that Obama has many white supporters too.
Obama got 34% in Iowa and 36% in NH. If you consider the size of the black vote in both states (and assume that almost all black voters voted Democratic), at least 80% of Obama’s voters must have been white in Iowa and at least 90% in New Hampshire.