A filibuster is a long speech that can be used by a senator to block a bill or other motion from consideration in the US Senate. Strom Thurmond famously holds the record at 24 hours and 18 minutes, but some recently published evidence suggests he may have broken the filibuster rules. You can read the article from the National Constitution Center here, and see the congressional record containing Thurmond's filibuster here. He was attempting to block passage of the Civil Rights Act of 1957.
Rand Paul's 2013 filibuster over the confirmation of John Brennan to the post CIA Director can be found here.
Rand Paul's 2013 filibuster over the confirmation of John Brennan to the post CIA Director can be found here.