Describe John McCain's response to a woman who said she could not trust Obama because he was "an Arab"(18) and what is the implication according to Lalami in "Allegiance"?

When a woman told McCain she could not trust Obama because he was “an Arab,” (18) McCain replied that Obama was “a decent family man [and] a citizen” (18). Lalami writes that McCain’s response assumes a contradiction between an Arab and “a decent family man” (18).