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So, in Kennedy's case, he was a Catholic. And people thought after the Al Smith election and so forth that a Catholic couldn't win in the United States. But when he was able to win in West Virginia, he proved that a Catholic could win, even in a heavily Protestant state.

"The American Political Invention That 'Let The People Rule'". "Weekend Edition Saturday" with Linda Wertheimer, www.npr.org. December 26, 2015.
So, in Kennedy's case, he was a Catholic. And people thought after the Al Smith election and so forth that a Catholic couldn't win in the United States. But when he was able to win in West Virginia, he proved that a