Drawing on collaborative research from a distinguished team at Harvard and Manchester universities, 'The age of Obama' asks how two very different societies are responding to the tide of diversity that is being felt around the rich world. 'Guardian' journalist Tom Clark, Robert D. Putnam - best-selling author of 'Bowling alone' - and Manchester's Edward Fieldhouse offer a wonderfully readable account. Like 'Bowling alone', 'The age of Obama' mixes...