Edward Moore "Ted" Kennedy was the senior United States Senator from Massachusetts and a member of the Democratic Party. He was the second most senior member of the Senate when he died and was the fourth-longest-serving senator in United States history, having served there for almost 47 years. As the most prominent living member of the Kennedy family for many years, he was also the last surviving son of Joseph P. Kennedy, Sr. and Rose Kennedy; the youngest brother of President John F. Kennedy and Senator Robert F. Kennedy, both victims of assassination; and the father of Congressman Patrick J. Kennedy. Kennedy entered the Senate in a November 1962 special election to fill the seat once held by his brother John. He was elected to a full six-year term in 1964 and was reelected seven more times before his death. The Chappaquiddick incident on July 18, 1969, resulted in the death of his automobile passenger, Mary Jo Kopechne. Kennedy pleaded guilty to a charge of leaving the scene of an accident; the incident and its aftermath significantly damaged his chances of ever becoming President of the United States. His one attempt, in the 1980 presidential election, resulted in a Democratic primary campaign loss to incumbent President Jimmy Carter.