Five years ago today, an ailing Sen. Ted Kennedy (D-Mass.) made a dramatic return to the Senate floor after being diagnosed with brain cancer.

Kennedy returned to cast a single vote to help break a Republican filibuster of an important Medicare bill. Kennedy, who was 76 at the time, shouted "aye!" and flashed two thumbs up as lawmakers gave him a lengthy welcome back to the Senate floor.

Watch a video of Kennedy's incredible reception above.

Also on HuffPost:

Loading Slideshow...
  • John F. Kennedy

    President John F. Kennedy speaks at a press conference on August 1, 1963. (Photo by National Archive/Newsmakers)

  • Husband And Wife

    A photo dated in the 1950s shows John F. Kennedy with his wife Jacqueline Bouvier Kennedy. (AFP/AFP/Getty Images)

  • Youth Movement

    John Fitzgerald Kennedy is pictured here in this 1960s White House photo. He was the first Catholic, and the youngest person, to be elected as president of the United States (AFP/Getty Images).

  • Happy Family

    U.S. Senator John Fitzgerald Kennedy (JFK) and his wife Jacqueline pose with their son John Jr. on December 10, 1960. (AFP/Getty Images)

  • Oath Of Office

    John F. Kennedy takes the Oath of Office for President of the United States in January 1961. (Photo by National Archive/Newsmakers)

  • Presidential Ticket

    An unlocated photo shows U.S. President John F. Kennedy (R) chatting with Vice President Lyndon B. Johnson in the early 1960s. (AFP/AFP/Getty Images)

  • Presidential Get-Together

    U.S. President John Fitzgerald Kennedy (L) meets in January 1961 at the White House, with former U.S. President Harry S. Truman (1884-1972). (AFP/AFP/Getty Images)

  • At The Podium

    John Fitzgerald Kennedy delivers a speech at the Waldorf Astoria hotel in New York city, 29 April 1961.

  • By His Side

    President John F. Kennedy speaks during a press conference as First Lady Jackie Kennedy looks on April 9, 1963 at the White House.

  • Facing The Press

    President John F. Kennedy arrives for a press conference on August 30, 1961 in Washington.

  • Making Choices

    U.S. President John Fitzgerald Kennedy signs the order of naval blockade of Cuba, on October 24, 1962 in the White House, during the Cuban Missile Crisis. (AFP/Getty Images)

  • Family Fun

    John Kennedy Jr. plays in the Oval Office at the White House, Washington, DC, on October 15, 1963.