Gideon Rachman's blog: As the US presidential election nears, so the game of "pick the next administration" will grow in popularity. I have been indulging in a little speculation of my own elsewhere.

In London, interest centres around the question of who will be the next US ambassador to Britain. If Barack Obama wins, the guessing game centres around Caroline Kennedy - a prominent Obama supporter, who spoke at the Democratic convention in Denver. This would be an interesting appointment, given that the last Kennedy to serve as US ambassador to Britain - Joe Kennedy - did not exactly cover himself in glory. He was forced to resign in 1940 after injudiciously suggesting that "democracy is finished in England".