It depends. Do you mean biased as in a quick inference? Because if so then it could be biased because hes probably just checking out the people around the 'family'. Some families look different even when related, and sometimes you cant tell if they really are. So most of the survey would be biased if he doesnt directly ask them.
The most likely purpose Congresswoman Chisholm included this statement in her speech is to explain how she felt about being discriminated against not only because of her race but also because of her gender.
