"I think he became President in order to increase his book sales," she said.
He said that book sales had continued to increase in the first eight months of this year.
Two weeks after the death, the book sales dropped, too.
Through book sales, the parents raised $3,100 last year for the library.
In the same period, he said, overall book sales grew by 14 percent.
I'm not a celebrity, and book sales are pretty bad at the moment.
Are you saying his endorsement could actually hurt sales of your book?
They also hold book sales to foster more reading of literature.
Some authors say that book sales are not the only goal.
After eight million book sales, it's hard to remember him as a typically broke student.