[RonF]

All this proves is that the driver doesn't like Pres. Bush. That sign isn't permanently stuck on there; the driver could easily just have dropped it in there and take it with her (my guess, given the text) when she leaves.

[Dont Mention the War]

All this proves is that the driver doesn't like Pres. Bush.

Network news vans don't have "drivers." Everyone that uses the van is directly involved in the newsgathering process: reporters, cameramen, producers, etc.

It's no different from Mary Mapes walking out of CBS's front door to hold a press conference wearing a t-shirt with the same line on it.