It's been a slow summer for shark attacks in Florida, so American cable TV news has had to content itself by filling its hours with the 'birther' movement, which is less organic than it sounds: the belief that Barack Obama was not born in the USA, and is therefore ineligible to serve as president. Despite some evidence to the contrary – such as a birth certificate validated by the Republican governor of Hawaii and its Department of Health, as well as birth announcements in two Honolulu newspapers – the birthers have managed, according to the latest poll, to convince a majority of Republicans that Obama is as foreign as his name, and part of some Kenyan (or something) conspiracy to turn the White House red.