Nielsen reports that books published by Senator Barack Obama are outselling books by Senator John McCain by a very large amount. Obama has sold 912,000 copies and McCain has sold 116,000 copies.
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.
Nielsen 
