What if JFK hadn't published "Profiles in Courage" in 1956?

https://en.wikipedia.org/wiki/Profiles_in_Courage JFK's Pulitzer prize winning book "Profiles in Courage" was, apparently not his work at all, but, primarily the work of his brilliant speechwriter, Ted Sorenson. The book is largely a defense of Southern "moderates" -- pro-slavery and pro-union -- in the period leading up to and immediately following the U.S. Civil War. It is well written and researched, and, no doubt, was quite useful in establishing Kennedy's credentials, quite mistakenly, as an "intellectual". While only a small proportion of American voters would have read this book in 1960, undoubtedly virtually all the reporters and talking heads on television on radio would have read it, and seen it as representing Kennedy's abilities and views. So, Kennedy, although a Senator from the fountainhead of abolitionism -- Massachusetts -- might be seen as trying to present himself as sympathetic to southern segregationists, an essential group to maintaining the "solid south" so necessary to the Democratic Party at the time. So, let's suppose that Kennedy had never published this particular book. So, he isn't a Pulitzer Prize winner, and, he hasn't published a book suggesting that he has no problem with slavery, per se, and that he has deep and profound sympathies for the South, despite being an Irishman from Massachusetts. How exactly does this affect his chances of being elected President, or, for that matter, even getting the Democratic nomination, in 1960? I would say, that Kennedy has rather less chance of getting the nomination, and, given how close the election was, that he is very unlikely to defeat Richard Nixon in the Presidential election, in 1960, without this book having given him a patina of respectability for the Southern Segregationists. After all, in South Carolina, for example, Kennedy only defeated Nixon by 10,000 votes. Without his book, Kennedy might have been seen as an abolitionist carpetbagger, and lost this, and other southern states, to Richard Nixon.