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I just noticed a very familar face sitting two sections to my right. The entire Kennedy family seems to be here. There are at least three and possibly four generations.
The one I recognized first was Maria Shriver... no sign of Arnold. Ethel Kennedy is also here. Ken Burns is with them also.
Looks like there's a pretty good chance that Senator Kennedy is in the building. I guarantee you that when he comes out the Pepsi Center will be louder than it's ever been.
Update from Matt: Ambinder: "Source: Kennedy appearance a "go." Expected in the hall around 910-920 ET"