author adam parker and his book "outside followed by a discussion on the political divide with jennifer kavanaugh and michael rich. on sunday at 1:00 p.m. eastern, elliott gorn in his book. author bob on reagan, an american journey. at 8:05 p.m. eastern, jeanmarie laska's talks about her book "to obama, with love, anger, joy, and hope." >> in greenwood, south carolina at a rally in 2007, the rally was a bust. no one but a small gathering of local folks needing something to do. obama was looking out at the emptiness. fired up, ready to go, the woman with the gold tooth abruptly shouted. and as if on cue, the people around her repeated her words, began to chant, and in an instant the rally went from dismal to glorious. it shows you what one voice can do, that one voice can change a room, obama said at a campaign rally over a year later recounting the sick -- the story. if a voice can change a room, it can change a city. afterwards, republican senator ben sasse talks about his book. he is interviewed by arthur brooks, president of the american enterprise institute. >> i do not think political tribalism is the story of the moment. it is filling the vacuum of declining local tribes, the