PaulB - the problem is it is the Government that is 'tired and exhausted' and needs changing. As for Obama, as I said he is not planning any kind of duplication of the UK position. Here is Fraser Nelson's article on this.
http://www.spectator.co.uk/coffeehouse/3224836/obamas-stimulus-looks-nothing-like-browns-whatever-our-pm-might-say.thtml
The 'clean start' approach is a sensible one and a good tac for Cameron to take. Brown carries a very large amount of responsibility for the trouble the UK economy is in, his misjudgements got us here and more of his misjudgements will not speed our way out of it. Indeed, the actions he has taken so far are either largely ineffective (VAT cut and bank bail-out) or counter productive in a way that deepens the recession (failure to cut public spending, extra borrowing splurge, more red tape on businesses, higher taxes on small businesses). Only a few items are helpful, delays to tax/VAT payments for instance.