Donald Trump’s plot to skew the upcoming election by wrecking the Post Office could also cripple the nation’s bookstores. Danny Caine, owner of Raven Book Store in Lawrence, Kan., is raising the alarm. He just published a pamphlet called “Save the USPS,” which he describes as “a small business’s love letter to an essential American institution.” (Order here, $3.) A rousing throwback to the old pamphlet wars, “Save the USPS” outlines the Republicans’ long war against the Post Office and explains Trump’s recent assault.