50 years later: The unfulfilled promise of John F. Kennedy and his generation-defining death

The nation marks a half-century since the assassination of President John F. Kennedy. Many who were alive on that fateful day recall exactly where they were and what they were doing.

FILE - In this Aug. 21, 1960 file photo, illuminated by a spotlight, Sen. John F. Kennedy, Democratic presidential nominee, speaks to an audience in Des Moines, Iowa. (AP Photo)

FILE - In this Aug. 21, 1960 file photo, illuminated by a spotlight, Sen. John F. Kennedy, Democratic presidential nominee, speaks to an audience in Des Moines, Iowa. (AP Photo)

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