It’s a good thing President Obama already has written two autobiographies; otherwise, he would have a hard time finding a kind word on the bookshelves. The publishing industry is pumping out anti-Obama books authored by conservatives in numbers normally reserved for young-adult novels about teenage vampires. More than 30 nonfiction titles blasting the president have been released by publishers this year, with several more hotly anticipated works expected to hit bookstores before the Nov. 6 election. You might expect to see a similar deluge of pro-Obama books by liberal authors, but it’s not even close. The only laudatory book about...