President Obama, the merchandising phenomenon, has been a boon to sidewalk T-shirt vendors everywhere, the Washington Times reports. Less conspicuous, perhaps, is the equally robust success of the children's book industry in marketing Obama's hopeful aura and personal history to parents of young children. Are children's book publishers seeking to indoctrinate impressionable young readers -- or are they simply obeying the laws of supply and demand? When the country elects a new president, publishers characteristically issue a biography or two geared toward young readers. But in the case of Obama, publishers are tapping into unusual levels of excitement and curiosity....