AP or MiniTrue?
As someone who voted for Obama, the media presumption is still disturbing, because it's part of a larger pattern of shameless use of narrative as power.

Here's the thing: The AP first posted their story about Obama winning at noon - half a day before polls close, let alone show results.

Since then they've posted multiple versions of the same story, with no indication there's more than one. It seems AP is striving to post a leading article in search results then keep revising the article until it matches reality.

One says "AP tally: Obama effectively clinches nomination" while another says "AP tally: Obama clinches Democratic nomination". Both say AP proved he has the winning number of delegates and both are misleading.

A recent version claims an alleged 18 superdelegates "had confirmed their intentions to the AP" and "five delegates Obama was guaranteed as long as he gained 15 percent of the vote".

Before it said: "another 15 who have confirmed their intentions to the AP" and "11 delegates Obama was guaranteed as long as he gained 30 percent of the vote".

Yet another version says: "16 who have confirmed their intentions to the AP" and "11 delegates Obama was guaranteed as long as he gained 30 percent of the vote".

All of these rely on uncounted votes and still fall short of the actual number needed to clinch the win.

According to ABC the confirmed count when AP first posted way:

COUNTDOWN TO THE NOMINATON:
OBAMA: 33.5
CLINTON: 198

The NBC NEWS Delegate Counts:
PLEDGED: Obama 1729 to 1625
SUPERS: Obama 339 to 295
EDWARDS PL.: Obama 16.5 to 0
OVERALL: Obama 2,084.5 to 1,920

* 190.5 undeclared supers.

ABC, unlike AP, provides a clear trail of changing information.

I have a problem with a news service trying to be first through such manipulation. Declaring the outcome of a vote before it's halfway complete is arrogant and irresponsible - the state elections they treat as a done deal (which discourages turnout) have other issues on the ballot. It doesn't matter if it's close - this is still leading the story.

Note that even with the alleged 18, 15 or 16 the 172 undeclared could give Clinton excuse to justify a floor fight. Which she might do as she saying no concession in direct respons to the AP story. It may be she's staying just because the media pissed her off. To quote Juliette Lewis: "Next time don't be so fucking eager."