Which of the following later activists would most likely have agreed with the argument in the excerpt?

Supply-side economics and calls for large tax cuts became more prominent in later decades, particularly during the Reagan administration in the 1980s. During the 1964 election, the political discourse was largely focused on the aftermath of New Deal policies and civil rights, rather than on supply-side theories which were not yet fully articulated or embraced by the major parties.

In 1964, southern states exhibited significant resistance to federal civil rights legislation, as evidenced by the contentious political climate surrounding civil rights issues. The election underscored divisions rather than support, indicating that southern states were not yet ready to embrace federal intervention in civil rights.

The anti-Vietnam War movement gained momentum later in the 1960s, particularly after the 1964 election. While foreign policy was a topic of discussion, the war's opposition did not significantly shape the Democratic Party's platform during this presidential race, making this choice less relevant.