Leibovich describes Twitter as one giant Larry King USA Today column--which, having enjoyed the surreal soup of bon sequiturs that was King's column.... is just about a perfect analogy.
The book is full of snark, and its gossipy tone isn't really offset by its self-loathing about gossipiness. Yet every page or so there's a revelation, or an incisive observation, or just a funny smart line (one woman is a "human ladle" at the self-satisfaction buffet).
Not quite up to the standards of Richard Ben Cramer's What It Takes, but what is? (Lord knows the Halperin and other guy books on the last two Presidential campaigns were nowhere near that quality. Leibovich, on the other hand, is pretty damn close.). Excellent reporting. But meta-gossip is still gossip.