Barry Goldwater presidential campaign of 1964
{'<entity_0>': 'Barry Goldwater presidential campaign of 1964', '<entity_1>': 'Barry Goldwater'}
[['Barry Goldwater presidential campaign of 1964', 'participant', 'Barry Goldwater']]
The <entity_0> began when United States Senator <entity_1> of Arizona elected to seek the Republican Party nomination for President of the United States to challenge incumbent Democratic President Lyndon B. Johnson.
['political campaign', 'presidential campaign']