http://www.salon.com/politics/war_room/2008/06/03/obama_declaration/print.html

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Alex Koppelman
Jun. 04, 2008 | Just as polls closed in South Dakota, where residents were voting in the state's Democratic primary, both CNN and MSNBC made a call. Surprisingly, though, it wasn't about the results of the primary, but about the nomination itself -- both declared Barack Obama the presumptive Democratic nominee based on their projections of the delegate allocation from the state. The Associated Press and ABC News had each made a similar call earlier.
-- Alex Koppelman