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The 1980 race sees President Jimmy Carter and Republican Ronald Reagan having to fight off fierce challenges from within, as both parties struggle to re-invent themselves and use the global media spotlight to their advantage.
The 2008 race sees freshman Democratic Senator Barack Obama go up against "maverick" Republican Senator John McCain.
The 1964 race is held in a country still reeling from the assassination of President John F. Kennedy and pits incumbent Democratic President Lyndon B. Johnson against conservative Republican Barry Goldwater.