From the Obama campaign:
Chicago, IL – Senator Barack Obama will kick off his trip to the Democratic National Convention on Saturday, August 23, 2008 with an event at the Old State Capitol in Springfield, Illinois, where Obama officially announced his campaign for president on February 10, 2007.
It now seems the most likely scenario is that the campaign will reveal the choice sometime on Friday, and Obama will make his first appearance with his running mate in Springfield.
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