It is that Mr Brown is an incumbent where Mr Obama is an insurgent.
If anyone deserves hunting, it is Messrs Brown and Blair themselves.
So, in political terms, it is understandable that Mr Brown's government is obliging, at the same time portraying the Tories as guardians of the wealthy.
Meanwhile it is forcing Messrs Brown, Darling and Reid into undignified scrambling for new seats.
It is that Mr Brown's current, resolutely unapologetic approach isn't working.
Nor is it Mr Brown's fault that his succession was followed by a dip in the impressively consistent economic growth over which, as chancellor, he presided, and by biting rises in the price of energy and food over which he has little control.
It is another blow for Brown in his desperate pursuit to sign another striker for a Hull side that is among the favourites for Premier League relegation this season.
It is not likely that Greg Brown and the new Icahn influenced regime is likely to have a lot of success repairing Motorola anytime soon.
It is true that Mr Brown has detailed views on an unusually broad range of policies.
"It seems Gordon Brown is as addicted to spin and media manipulation as Tony Blair was, " he said.
Rumour has it that Mr Brown is privately polling in important marginal seats.
True, it is arguable that Mr Brown ought to have increased taxes by more than he did in his 1997 budget.
Whether it is enough to keep Brown in his job remains to be seen but the 50-year-old will feel hard done by if he is sacked after such a spirited performance by his players.
The nine reorganisations in ten years, who has been one of the orchestrators of that, it is actually, Gordon Brown himself and I don't think we're going to see a change from those things.
Right now, it is the black black oil, which is filling Brown's black hole.
Despite a plea for haste from Mr Brown, it is not expected until towards the end of the year.
He has written to Gordon Brown saying it is a matter of "urgency", given the speculation about a snap election.
BBC: NEWS | UK | UK Politics | Cameron seeking Whitehall talks
Despite this week's rate cut, it is too early for Mr Brown to claim that he has rescued Britain from boom and bust.
For Mr Brown, it is simply a matter of being able to build lots of schools and hospitals which his celebrated fiscal prudence would not otherwise allow.
But many of the names are still deep in the red from the earlier disasters, and it is to them that Mr Brown has thrown a lifeline.
The labour of love of eccentric English aristocrat Sir Stewart Gore-Brown, it is approached down a long, tree-lined drive, flanked by farm buildings, settlements and workers houses, giving it the air of an old feudal domain.
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"We haven't been to Ireland for seven years, and the demand is probably twice what it was before, which is probably twice what it was the tour before that, " Brown tells CNN.
"Let it ring out from our conference today: the Conservative Party is ready, it is hungry for victory and if Gordon Brown ever summons up the courage to call an election we are going to beat him, " said Mr Hague.
BBC: NEWS | UK | UK Politics | We can beat Brown, insists Hague
But it is at least odd that Mr Brown should be willing to risk so much on their behalf.
Which, perhaps, make it rather laudable that Mr Brown is having a go.
Mr Blair and the chancellor may have agreed a truce, but it is premature to conclude that Mr Brown has really come into line.
It is also a risky one for Brown, whose 142, 000-person firm has long bragged to clients it can be trusted as "technologically agnostic, " unlike the services unit at rival IBM.
Even if all the tax they pay is VAT on expensive meals in London restaurants or stamp duty on flats in Mayfair, it is still additional income for Mr Brown.
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