 Complete the following phrase:  In the election of 1964, incumbent Democratic United States President Lyndon B. Johnson won the largest popular vote landslide in U.S. presidential election history over Republican United States Senator Barry Goldwater. During the presidential term that followed, Johnson was able to achieve many political successes, including passage of his Great Society domestic programs including War on Poverty legislation, landmark civil rights legislation, and the continued exploration of space. Despite these significant achievements, Johnsons popular support would be short-lived. Even as Johnson scored legislative victories, the country endured large-scale race riots in the streets of its larger cities, along with a generational revolt of young people and violent debates over foreign policy. The emergence of the hippie counterculture, the rise of New Left activism, and the emergence of the Black Power movement exacerbated social and cultural clashes between classes, generations, and races. Adding to the national crisis, on April 4, 1968, civil rights leader Rev. Martin Luther King Jr., was 