Palin's words avoid repulsing voters with overt racism. But is there another subtext for creating the false image of a black presidential nominee "palling around" with terrorists while assuring a predominantly white audience that he doesn't see their America?

In a post-Sept. 11 America, terrorists are envisioned as dark-skinned radical Muslims, not the homegrown anarchists of Ayers' day 40 years ago. With Obama a relative unknown when he began his campaign, the Internet hummed with false e-mails about ties to radical Islam of a foreign-born candidate.

Whether intended or not by the McCain campaign, portraying Obama as "not like us" is another potential appeal to racism. It suggests that the Hawaiian-born Christian is, at heart, un-American.