How does she define the paradox of whiteness and how does she relate this paradox to President Obama’s broad appeal and support in the chapter “Know Your Whites?

Tressie McMilan Cottom writes that “I however am not sure what social progress would look like given that its existence relies on the paradox of whiteness.” How does she define the paradox of whiteness and how does she relate this paradox to President Obama’s broad appeal and support in the chapter “Know Your Whites?”