A website called 90days90reasons.com went online this summer, after the writer Dave Eggers got worried about the diminishing enthusiasm for Barack Obama among people like him. Eggers is a hipster, I guess you’d call him. He lives in San Francisco. He’s best known as the author of A Heartbreaking Work of Staggering Genius, a long, funny, clever, and annoying memoir, which was published, like Barack Obama’s less funny and less annoying memoir, when its author was scarcely pushing 30. Kids grow up so quickly these days.