The candidacy of John F. Kennedy provoked widespread discussion of issues relating to church and state and to the role of Catholics in American politics. This text is the inside story of that dramatic campaign and is the first scholarly examination based on actual voting returns. It includes a detailed analysis of the vote in every county, revealing that religion affected the outcome of the election far more than previously thought. Kennedy lost more votes than he gained due to his religious affiliation, but by crafting a strong coalition, he prevailed in one of the closest races in presidential history.