http://news.bbc.co.uk/2/hi/americas/2862343.stm

BBC explains it.

Bush plays on the ignorance of the American people. The American people are historically dumb and believe anything they see on TV. When they hear President Bush say there are 30 countries that support America, they take it at face value. They don't bother to question why or how they support America. The image of Britain and Spain are the only images they know of support for an American war. So they automatically assume all the other countries support the US in the same manner. The BBC explains some of the reasons why countries would support the US and how some of these countries support the US.