After 9/11, the Fox News Channel rallied a huge portion of the country around the Bush administration’s vision of the world. But as the U.S. marched to war in the Middle East, journalists, liberal watchdogs, and comedians began pushing back. Could The Daily Show, Fox News’ own liberal pundits, or...

For a decade and a half, CNN was peerless and ambitious, and it understood its place in the world. At least, it thought it did—until Fox News burst onto television screens. Could CNN save itself by becoming conservative or by going tabloid? And how would CNN and Fox respond when September 11 made...