Spot the difference

Some revealing semantics at the Bush-Blair press conference yesterday.

George Bush: 'I also believe we're going to succeed. I believe we'll prevail. Not only do I know how important it is to prevail, I believe we will prevail.'

Tony Blair: 'I am sure that it is possible to resolve this [the situation in Iraq] and I also do believe that if we do, then it would send a signal of massive symbolic power across the world.' [My emphasis]

'If' and 'would', Prime Minister? Surely 'When' and 'will'?