Obama supporters read Jonathan Franzen and the socio-economic commentary Nickel & Dimed while Romney's fans are into John Adams's biography and highly rated Ayn Rand's Atlas Shrugged, according to Goodreads' pre-election survey.
The crowdsourced book site tracks users' collections, reading habits, and review ratings.
By asking its members who they would vote for in the 2012 US presidential election, Goodreads came up with some interesting stats.
Those who support Romney tend to dole out a higher average rating in their reviews: 3.88 out of 5 as opposed to the 3.43 of the Obama crowd.
They were also four times as likely to have read Heaven Is for Real: A Little Boy's Astounding Story of His Trip to Heaven and Back by Todd Burpo with Lynn Vincent -- whether they agreed with it or not is another matter.
Michael Lewis's analysis of the economic crisis was popular with both sides, receiving an impressive 4.16 average rating from the Obama camp and 4.17 from Romney supporters.
Those backing Romney were also much more likely to think well of the Ayn Rand work Atlas Shrugged, unsurprising given Rand's own stance on government, personal success, and society at large.
The title has climbed to third on Amazon's list of best-selling Republican-leaning books, joining Bill O'Reilly's Killing Lincoln, Ann Coulter's Mugged, the Arnold Schwarzenegger autobiography, and Cowards by Glenn Beck.
By contrast, the Amazon Election Heat Map identifies America Again by Stephen Colbert, The Price of Inequality, Who Stole the American Dream and The Righteous Mind as the current best selling 'Blue' books.