@H2O MAN,
Except then he said that, whoops, he HASN'T made his VP pick...
I tend to agree with analysis that a) it'd be bad form to announce tonight, and would get some blowback, and b) there isn't really any stepping on this story. If McCain announces his VP tonight, THAT'S the story that'll be buried -- not Barack Obama accepting the nomination on the 45th anniversary of MLK's "I have a dream" speech.