How often does a novel earn its author both the Presidential Medal of Freedom, awarded to Harper Lee by George W. Bush in 2007, and a spot on a list of "100 best gay and lesbian novels"? Clearly, To Kill a Mockingbird, Lee's Pulitzer Prize-winning tale of race relations and coming of age in Depression-era Alabama, means many different things to many different people. In Mockingbird Passing, Holly Blackford invites the reader to view Lee's beloved...