I'm guessing that this article will show up in the Week in Review section, which will explain why it's a history lesson/opinion piece.
Here's what Paul Begala thinks hurt Gov. Dean in the first two primaries: "'I think the governor was almost ill-served by the loyalty of his core supporters,' said Paul Begala, the liberal co-host of "Crossfire" on CNN. Mr Begala said the continued flow of money into the campaign despite early mistakes had allowed Dr. Dean to believe that "the laws of political physics have been repealed" for him. " Thank goodness the press was there to show us what happens when good people love too much.
But read the whole thing to see what unnamed "major supporters" and "Democrats inside and outside of the Dean campaign" think. Or what "a senior campaign official, speaking on condition of anonymity" has to say. Kate O'Connor, a long-time member of Gov. Dean's organization, is quoted and named for a nice change of pace. We also get the opinions of a few Democratic strategists who worked on losing campaigns. And you also get to find out what Ms. Wilgoren and Mr. Rutenberg consider to be the "tipping point". It "came on Jan. 8, when "NBC Nightly News" broadcast a tape of Dr. Dean, from four years before, criticizing the Iowa caucuses on which he was now relying to vault him to the nomination. His aides wondered how their own research department had missed this minefield. His Iowa poll numbers dropped 10 points overnight."
I have my own theories about tipping points and supporters but I'll wait to talk about them until the Primaries are over and I have a complete picture of what's gone on.
UPDATE 2/1/04: Looks like it's Wrap Up Sunday at the NY Times. They have this article and a history of Kerry's primary campaign on the front page. The Kerry story has named sources, probably because it's fun to talk to the press when you're ahead and they want to talk about why you're ahead instead of how you can be stopped.