of thee i sing: a letter to my daughters is a children's book by united states president barack obama. it came out on november 16, 2010. it is about the lives of thirteen americans: george washington, abraham lincoln, martin luther king, neil armstrong, sitting bull, cesar chavez, billie holiday, maya lin, albert einstein (who was born in germany), georgia o'keeffe, jackie robinson, helen keller, and jane addams. obama finished writing the book in 2008, after he was elected but before he took office.