As a Bush supporter, I too have looked for a good answer for why they will testify together, and have yet to hear any. I think the best justification is that the committee can kill two birds with one stone by the joint testimony, when they should consider themselves fortunate that the president and vice-president are even testifying at all. LBJ, when asked to testify in front of the Warren Commission, just said no, that presidents don't do that sort of thing. (Interesting considering the theories that he was far more directly responsible in that situation) That was another time and age when the media were far less politically powerful, and the fact that Bush is testifying, even with Cheney there too, speaks to the different political climate.
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