If book sales could predict the presidential election...

...Mitt Romney would win in a landslide -- that is, according to Amazon.com's best estimates.

"The Amazon Books Editorial team pulled extensive lists of best-selling books in relevant categories and vetted them using a variety of tools for clear partisan leaning, separating them into red and blue categories," the company says.  "Many books, of course, have no clear political bias, and therefore were not included."

By tracking the sales of Republican- of Democrat-slanted books, Amazon predicts a big win for Romney with conservative book sales depicted in red, Democrats in blue.  The stronger the color, the greater the majority:

So, the place with the most conservative readers appears to be Mississippi (72% "red" purchases), while Washington, D.C. is predictably chock full of liberal bookworms (78% "blue" purchases).  True to its swing-state status, however, Pennsylvania readers are split at an even 50-50.

(Click here to view the interactive map and see what voters are reading in your state.)

If you look at the 2012 race based solely on the candidates' book sales, Obama leads with his "Audacity of Hope" selling nearly double the number of copies of Mitt Romney's "No Apology."  However in the VP race, Paul Ryan's "Young Guns" has sold considerably more copies than Joe Biden's "Promises to Keep."  (Who even knew that Joe Biden wrote a book?)

"Just remember, books aren't votes, so a map of book purchases may reflect curiosity as much as commitment," Amazon notes in a disclaimer, "but we hope our 2012 Election Heat Map will provide one way to follow the changing political conversation across the country during this election season."