Jefferson Smith's fictional 23-hour filibuster was actually eclipsed many years later in real life, when Sen. Strom Thurmond of South Carolina held the floor for 24 hours and 18 minutes – still the Senate record for a one-man filibuster. He finished the morning of Aug. 29, 1957. Thurmond, who was then a Democrat, was staging an attempt to block a weak civil-rights bill that even some other Southerners favored.
Filibusters continued to block serious civil rights legislation right up until 1964, when the Senate was finally able to muster the two-thirds majority that was then required to end debate. The last to filibuster against the landmark 1964 legislation was Sen. Robert Byrd of West Virginia, who spoke for 14 hours and 13 minutes, finishing the morning of June 10 – the 57th day of debate on the measure.
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