As the 50th anniversary of John F. Kennedy’s assassination approaches next month, polling released Tuesday as part of a new book about Kennedy’s legacy shows that he remains one of the most highly rated presidents of the past 50 years. The findings, from a survey of more than 2,000 adults conducted this summer, were released Tuesday to coincide with the release of a new book from University of Virginia political scientist Larry Sabato, which takes on evidence of popular conspiracy theories about Kennedy’s assassination and analyzes his lasting legacy.