If all that were necessary to win the presidency was a best-selling book, Ben Carson would soon be in the White House.

The retired John Hopkins neurosurgeon is winning the race of highest book sales, in either party. His book, One Nation: All that We Can do to Save America's Future, has sold 362,813 copies since its release in May 2014.

The closest contender is Hillary Clinton with her Hard Choices memoir, which has sold 264,000 copies since it hit shelves in June 2014.

Although at least eight other presidential candidates have published books since 2012, Carson's book is clearly outpacing the rest of the pack, according to Nielsen Bookscan. In fact, his book has sold more copies than the 15 books written by 10 other Republican candidates combined, which total 252,177 copies.

Mike Huckabee's book, God, Guns, Grits and Gravy, takes third place with 65,939 hardcopies sold. Sen. Marco Rubio's memoir, An American Son, sold 36,786. Texas Gov. Rick Perry's Fed Up! Our Fight to Save America from Washington has sold 27,264.

Rand Paul's book, Blue Collar Conservatives: Recommitting To An America That Works is on the other end of the spectrum with about 4,000 copies sold.

While the winners and losers of the book primaries don't tend to be indicators of the Oval Office champions, writing biographies recently has been a lucrative business for political figures.

In 2004, Bill Clinton made $15 million just on the advance of his book, My Life. Decision Points, the autobiography that George Bush released in 2010, sold two million copies in its first month on the shelves. And in 2009, sales from Obama's two books, The Audacity of Hope and Dreams from my Father, grossed $5.7 million combined.

And even if Carson's individual book sale records top Clinton's, it seems unlikely that the novice politician's book advance would have been more than the $14 million Clinton was paid ahead of Hard Choices.

Despite the numbers, all that book sales really indicate is that Carson and Clinton are making more money than Huckabee and Rubio.

Although Carson currently stands at third in the RealClearPolitics polling average, most do not believe his bid for the White House will land him at 1600 Pennsylvania Ave.