If book sales were electoral votes, the U.S. presidential election would hardly be a close contest.
So far in 2008, four books published by Sen. Barack Obama between 2004 and fall 2008 have sold a combined 912,000 copies, according to Nielsen BookScan. 
In comparison, Sen. John McCain’s five titles, published between 1999 and summer 2008, have sold a total of 116,000 copies — almost 800,000 copies less than Obama.
Between January and September 21, 2008, McCain’s top selling book, “Faith of My Fathers,” sold 73,000 copies in hardcover, paperback, and audio editions. 
Obama’s top …