"I believe hugely in advertising and blowing my own trumpet, beating the gongs, drums, to attract attention to a show," Phineas Taylor Barnum wrote to a publisher in 1860. "I don't believe in 'duping the public, ' but I believe in first attracting and then pleasing them."The name P.T. Barnum is virtually synonymous with the fine art of self-advertisement and the apocryphal statement, "There's a sucker born every minute." Nearly a...