Make no mistake: Obama has landed. The US President's arrival at Stansted yesterday makes almost all of the frontpages and is leading most news coverage. One of the many questions on the lips of Labour-minded people I speak to is whether all this is helping or harming Gordon Brown. With much of the other G20 coverage focusing on either splits between the countries or compromises that are having to be made, there is - rightly or wrongly - a sense that Obama is here to hold things together. Indeed, the "after the break" preview for the News at 10 last night started with something like, "Obama arrives: but can he rescue the G20 summit?". And that's a message which cuts right through Brown's world-saving pomp of the last few months.