For campaign reporters on and off the plane, Twitter was the usually the first iPhone app they opened bleary-eyed in the morning, and the last one they peeked at before falling asleep at night.
Everyone in politics, it seemed, was on Twitter: journalists, editors, pundits, campaign managers, television producers, bureau chiefs, flacks, pollsters, activists, lobbyists, donors, wives of donors, daughters of donors, hacky operatives, buffoonish down-ballot candidates, cousins of direct mail specialists, interns desperate for re-tweets.

Did Twitter Kill the Boys on the Bus? (PDF)