"I've got a pretty long track record covering politics and news, so I'm not particularly worried that one-day blog chatter is going to destroy my reputation," Ifill said. "The proof is in the pudding. They can watch the debate tomorrow night and make their own decisions about whether or not I've done my job."

Ifill questions why people assume that her book will be favorable toward Obama.

"Do you think they made the same assumptions about Lou Cannon (who is white) when he wrote his book about Reagan?" said Ifill, who is black. Asked if there were racial motives at play, she said, "I don't know what it is. I find it curious."