From the Media Research Center [link from Little Green Footballs]:
"A serious journalist can't run with a story without confirmation. Two sources at the absolute minimum....This is how your narrator made it through Watergate. If I'd gone off half-cocked, if I'd gotten my facts scrambled, if I'd run with unconfirmed leads, I'd be selling insurance right now.-- Dan Rather in his 1994 memoir, The Camera Never Blinks Twice, page 97."