With the economy in turmoil, the national debt rising and millions of American families struggling to make ends meet, Barack Obama today put his hand in his pocket. But it was only to buy $32 worth of books from a shop in Martha's Vineyard as the President made his first trip out at the start of a 10-day vacation. Mr Obama visited the Bunch of Grapes book shop in Vineyard Haven with daughters Malia, 13, and Sasha, 10 and picked up five or six books.