What is a key reason goldwater lost to johnson in 1964?

The United States presidential election of 1964 was the forty-fifth presidential election of the country. It was held on November 3, 1964. President Lyndon B. Johnson had come to office less than a year before because of the assassination of his predecessor, John F. Kennedy. Johnson, who successfully associated with Kennedy's popularity, won 61.1% of the popular votes, the largest gain by a candidate since 1820. This was the sixth most unequal presidential election in US history. No Democratic candidate in the post-1964 elections achieved better results from the Electoral College than Johnson in 1964.  

Republican candidate Senator Barry Goldwater of Arizona suffered from a lack of support from his own party and his extreme right in political positions wasn't attractive to moderate voters. Johnson's campaign successfully portrayed Goldwater as a dangerous extremist, and defended social programs that became known as the Great Society. Johnson easily won the presidency, securing 44 of the 50 states and the District of Columbia.

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