I've mentioned in a number of recent posts how interesting and informative I have found the C-SPAN series "The Contenders" to be. Having finished listening to (I've received them as podcasts - but the full television programme can be viewed on the internet) the programme on Barry Goldwater - I have gone on to listen to the ones on Hubert Humphrey and George McGovern. As a result I've added the 1968 and 1972 "Making of a President" to my short term reading list.
(Both are also available as Kindle ebooks)