Sarah Vowell has written a superb book about three of the four murders of the president. JFK is omitted as it is within living memory and is well covered elsewhere. The president, their assassin, their relatives, the contemporary view, the succeeding vice president and where they are all buried now is all covered by her keen eye and acerbic wit.
SV is a fairly partisan Democrat.There are digs at Nader, George W Bush (although no-one else has drawn the parallels between Iraq and McKinley's occupation of the Phillipines). However this is only a couple of paragraphs in a 200 page book.
One passage deals with her and Nick Hornby in Gramercy Park,NYC, home to a statue of Edwin Booth [brother of John Wilkes Booth].