Please answer a question about the following article about Multiracial American:

Reacting to media criticism of Michelle Obama during the 2008 presidential election, Charles Kenzie Steele, Jr., CEO of the Southern Christian Leadership Conference said, "Why are they attacking Michelle Obama, and not really attacking, to that degree, her husband? Because he has no slave blood in him." He later claimed his comment was intended to be "provocative" but declined to expand on the subject. Former Secretary of State Condoleezza Rice (who was famously mistaken for a "recent American immigrant" by French President Nicolas Sarkozy), said "descendants of slaves did not get much of a head start, and I think you continue to see some of the effects of that." She has also rejected an immigrant designation for African Americans and instead prefers the term "black" or "white" .

Why did Steele think people were not attacking Barrack Obama?
Because he has no slave blood in him