Glenn Beck has a couple. Queen Latifah also has one to her credit. Sarah Ferguson, the duchess of York, has several. The only thing surprising about Stephen Colbert penning a picture book is that it has taken him this long. His debut, an adults-only insult to picture books everywhere, “I Am a Pole (And So Can You!),” is so deliberately bad and his fan base so fervent that it’s guaranteed to be a success — an ironic one, of course.