I have no idea - I have never met him - what Obama thinks of Britain, though in one of his attacks against Bush, he dismissively brackets the UK with Togo. McCain, whom I knew well and liked, is to all appearances a declared anglophile. But, none of this is relevant. America will act on an unsentimental calculation of where its national interest lies. The problem with the rhetoric of the Special Relationship is that it implicitly denies this reality, putting a burden of expectation on the ties between our two countries, which they cannot bear.While Meyer concludes with a subtle endorsement for Obama, overall he leaves the impression that neither Obama nor McCain will necessarily be better for Britain, since "America will act on an unsentimental calculation of where its national interest lies." That is, it does not matter who is president, because the United States will always act the same way, based on what is in its best interests. As President Lincoln once said: "I claim not to have controlled events, but confess plainly that events have controlled me."
Whoever wins, Britain must rest its relationship with America on four propositions: is America our single most important ally and partner? Absolutely. Does this mean that our national interests will always coincide? Absolutely not. Should we stand up for our interests when they diverge from the Americans? Absolutely. Will having rows with the US from time to time fatally undermine the closeness of the relationship? Absolutely not.
However, the argument that neither president will be better for Britain (or other allies in Europe, or the transatlantic alliance as a whole) attributes too little influence to the US executive branch. The fact is, different presidents push different policies and weigh the importance of allie's opinions differently. If Al Gore had been president in 2003, there is a good chance the US would not be at war in Iraq (or at least would have approached it in a less unilateral way), which would have prevented the transatlantic alliance from reaching a major low following the Iraq invasion.
McCain and Obama have different approaches to foreign relations, different world views, and different personal styles -- and one of them will be "better" for Britain than the other, regardless of events.