2 things.
#1 There is no reason that the president of the United States would need to even waste any time speaking to or acknowledging a racist hate-monger who is a member of a hate cult.
#2 Obama can't think on his own. His thinking is directed by the cult and to debate he would have to be able to give reasoned answers to un-rehearsed questions - He is not able to do that.
I would hope people that are Obama supporters invest time studying about mind control and the cults.