n an ordinary news day, CNN is like a sip of iced tea. Fox News is a gulp of Jolt Cola. It is the favorite news source of conservative-minded viewers, but Fox's anti-liberal sensibility is not its only draw. Even on matters as uncontested as the weather, Fox News's heart ticks to a faster, louder beat; it is a network that presents the news with pizazz and a frisky tone. ("Back to you, guys" is how reporters in the field address the anchors in the studio.) And its top commentators express a righteous indignation - mostly at the mainstream media,...