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When the book was republished in 1957 he added a preface in which he softened some of his criticisms , and he added an epilogue in which he attacked the religious liberalism of Reinhold Niebuhr and the conservatism of Walter Lippmann .
 person: Reinhold Niebuhr; person: Walter Lippmann
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Reinhold Niebuhr; person: Walter Lippmann