Another journalist wrote yesterday: 'President Obama is on vacation, and that means it’s the media’s sacred duty to overanalyze his summer reading plans.'
There is sarcasm there (overanalyze) yet that's what John Dickerson of Slate did. Most of the books are 'thrillers' might be being a US president isn't a thrilling job enough for the meantime).
 

Today, the authors and publishers of the books mentioned should be grateful to the president-- a survey done by Amazon showed that their sales showed drastic improvement! Here is the book list:
 

The Way Home by George Pelecanos
Lush Life by Richard Price
Hot Flat and Crowded by Thomas Friedman
John Adams by David McCullough
Plainsong by Kent Haruf
Common denominator: all writers are white male.