In 1996, William Jefferson Clinton received 47,401,898 votes (49.2%). In 2004 George Walker Bush received 60,645,844 votes (51%). I'm sure any writer can manipulate numbers to fashion an incisive quote, but Bush received a greater percentage of the popular vote than any Democrat president (except FDR and LBJ) in any election since 1856.
No, I'm not going to buy the book. I refuse to read any book that's never been read by it's "author".
Actually, two Democrats in the last century (Woodrow Wilson in 1916 and Harry Truman in 1948) won re-election with a 3% margin in popular votes. Unlike George W. Bush, however, neither broke 50%.