Never mind Air Force 1, the Us Security Services have commisioned two new Battle Buses for POTUS and any challenger allowing them to cruise in style and safety around the USA.
http://news.bbcimg.co.uk/media/image...5_54622654.jpg
They probably come with as much security as you can handle and as many mod-cons as you like.
Of course, if they had been around in Bill Clinton's day, I bet it would have come with a bed in the back.
