Question: When did Kennedy take office as a New York Senator?
About the article "Assassination of Robert F. Kennedy", section "Background".

Candidate passages:
Kennedy first considered running for political office in 2000 when he considered running for United States Senator in New York.
After deciding not to run in that election, he again considered running in 2005 for Attorney General.
With the possibility of a matchup against his then brother-in-law Andrew Cuomo generating media interest, Kennedy again decided not to run, despite being considered the frontrunner if he ran.
In a January 2007 interview in "", Kennedy said he would consider running for the potentially open seat of then-United States Senator Hillary Clinton of New York if she were to win the 2008 Presidential election.
RFK Jr.'s father was elected to that seat in 1964 and held it for more than three years.
Clinton did not win the election and Kennedy announced on December 2, 2008 that he would not run, feeling it would take too much time away from his family 
Kennedy visited the British Mandate of Palestine in 1948 and wrote dispatches at the time for the "Boston Post" about his trip and the effect it had on him when he was twenty-two years old.
During his stay, he wrote that he grew to admire the Jewish inhabitants of the area.
As a Senator, he later became a strong supporter and advocate for Israel.
Kennedy was United States Attorney General from January 1961 until September 3, 1964, when he resigned to run for election to the United States Senate.
He took office as Senator from New York on January 3, 1965.
The run up to the 1968 presidential election saw the incumbent president, Lyndon B. Johnson, serving during a period of social unrest.
There were riots in the major cities despite Johnson's attempts to introduce anti-poverty and anti-discrimination legislation, and there was significant opposition to the ongoing military action in Vietnam.
The assassination of Martin Luther King, Jr. on April 4, 1968 led to further riots across the US.
Kennedy entered the race for the Democratic Party's nomination for president on March 16, 1968—four days after Senator Eugene McCarthy received a large percentage of the vote in the New Hampshire primary against the incumbent President (42% to Johnson's 49%).
Two weeks later, a demoralized Johnson announced he was no longer seeking re-election.
One month later, Vice President Hubert Humphrey announced he would seek the presidency.
Humphrey did not participate in any primaries but he did obtain the support of many Democratic Party delegates.
Following the California primary, Kennedy was in second place with 393 delegates compared to Humphrey's 561.
Morse was a late entry in the race for the Democratic nomination for president in 1960.
It began unofficially at a 1959 press conference held at the state capitol in Salem by local resident Gary Neal and other Morse supporters.
They declared they would put Senator Morse on the ballot by petition.
As early as April 1959, Morse told a meeting of the state's Young Democrats that he had no intention of running.
The group still voted to advance Senator Morse, after Congresswoman Edith Green introduced him as a favorite son.
Gary Neal was persistent and by winter of 1959 was nearing completion of his signature petition to place Morse on the May ballot.
Morse soon found himself at a meeting with Neal where they discussed his efforts.
Neal said to Morse, “if we don’t put your name on the ballot, your enemies will."
It was clear the elephant in the room with Gary Neal and Wayne Morse was the Oregon Republican Party.
Morse shot back about the Oregon Republicans, “I say to the Republican Party, trot out your governor.
I’m ready to take him on.”On December 22, 1959, Wayne Morse announced his candidacy for the Presidency of the United States of America.
He said at his announcement, “Although I would have preferred not to have entered the Oregon race, I shall not run away from a good political fight if it is inevitable.” The Morse for President Oregon Headquarters was located at 353 S.W.
Morrison St. Portland, Oregon 97204.
The Morse entry into the presidential race did not sit well with many who had anticipated significant campaigning in Oregon from a large field of candidates.
Morse was accused of flip-flopping on whether or not he would run.
Morse filed to run in May primaries in the District of Columbia, Maryland, and Oregon, in that order.
He had solid connections in all three areas.
Oregon was his home and where his wife and family lived.
He owned a small farm in Poolesville, Maryland, and had spent fifteen years fighting for D.C. home rule, sponsoring legislation for that cause.
Kennedy did not enter the D.C. primary.
Senator Hubert Humphrey was Morse's main opponent in the D.C. contest, which Humphrey won 7,831 to 5,866.
Morse had known when he entered the Maryland contest that he was climbing an extremely steep hill, and had hoped to offset a potential loss there with a win in the District.
John F. Kennedy was a Catholic and Maryland was the birthplace of the American Catholic church.
Morse attempted to generate as much media coverage as possible.
The New York Times caught wind of the Morse campaign and did their best to follow Morse around.
Morse made his liberalism a key issue at every campaign stop.
His remarks in Cumberland, Maryland suggest that Kennedy was anything but a liberal:"When the Eisenhower Administration took office one of its first objectives was to riddle the tax code with favors for big business and it did so with the help of the Senator from Massachusetts.
We need a candidate who will reverse the big money and big business domination of government.
We need a courageous candidate who will stand up and fight the necessary political battle for the welfare of the average American.
Kennedy has never been willing to do that.
"As Morse had predicted, he lost to Kennedy in Maryland.
Morse continued to pursue his liberalism strategy as the campaign moved to his home turf.
Oregon Democrats prepared for a showdown between Morse and Kennedy, although five candidates would appear on the Oregon ballot.
Humphrey, to this point Kennedy's main challenger in the primaries, had lost badly to Kennedy in West Virginia and had dropped out of the race.
The Kennedy campaign began to focus on Oregon.
Its workers repeatedly denied that Morse was a serious candidate, but to make sure of a win, the campaign sent Rose Kennedy, and Ted Kennedy to speak in Oregon and outspent Morse $54,000 to $9,000.
Morse often found himself responding to Kennedy’s claim that he was not a “serious candidate”, by proclaiming: “I’m a dead serious candidate.” Quietly, Oregon Democrats began to worry about what a loss for Morse would mean in 1962 against possible Republican challenger Governor Mark Hatfield.
Morse would use this to his advantage to help sway undecided Democrats, claiming that if he lost in the primary, it would certainly help Republicans defeat him in 1962.
Kennedy brushed off this argument by claiming that regardless of the outcome of the presidential primary, the people of Oregon had a tremendous respect for Wayne Morse and would send him back to the Senate, and that he would even come back to Oregon in 1962 to campaign for him.
On Election Day, Morse came up roughly 50,000 votes short of defeating Kennedy.
Morse abandoned his presidential race that same week.
Morse largely sat out the rest of the 1960 campaign.
He even opted out of going to the 1960 Democratic National Convention.
Instead he sat at home and watched it on television from Eugene. 
Kennedy political family.
Members of the Kennedy family that have held high political US office: Joseph P. Kennedy, Sr. (1888–1969) "Joe", Ambassador to the UK *John F. Kennedy (1917–1963) "Jack" or "JFK", Congressman and Senator from Massachusetts, President of the United States *Robert F. Kennedy (1925–1968), "Bobby", Attorney General, Senator from New York **Kathleen Kennedy Townsend (born 1951) Kathleen Hartington, Lieutenant Governor of Maryland **Joseph P. Kennedy II (born 1952) "Joe", Congressman from Massachusetts ***Joseph P. Kennedy III (born 1980), "Joe", Congressman from Massachusetts *Jean Kennedy Smith (born 1928) Jean Ann, Ambassador to Ireland *Ted Kennedy (1932–2009), Edward Moore "Ted", Senator from Massachusetts **Patrick J. Kennedy (born 1967), Congressman from Rhode Island  
Although Kennedy has never run for public office, he has shown a consistent interest in public affairs, and has been involved in many campaigns, usually as a field organizer.
Kennedy began working as a field organizer for the first congressional campaign of Joseph Kennedy in 1986, where he organized wards in Allston and Brighton.
Later, he managed the re-election campaign for Senator Edward M. Kennedy in 2000.
Max Kennedy has volunteered on a number of other campaigns, including the presidential campaigns of Edward M. Kennedy in 1980; Michael Dukakis in 1988; Al Gore in 2000; John Kerry in 2004, and as a surrogate for Barack Obama in 2008.
In 2001 the Boston and New York media touted Kennedy as a possible candidate for Massachusetts's 9th congressional district, a seat vacated by Democrat Joe Moakley.
Kennedy never declared his candidacy, citing his desire to spend time with his family, including his three children under the age of 10.
Maxwell Kennedy endorsed then-Senator Barack Obama early in the primary season, and campaigned for Senator Obama throughout 2008 at approximately 200 events in crucial swing states, including Ohio, Colorado, New Mexico, Virginia, and Pennsylvania.
In Scranton, Pennsylvania, he visited diners and doughnut shops at six a.m. and led senior citizens in singing old Irish ballads at lunch centers; Kennedy campaigned in Indiana on Martin Luther King day and again during the Jefferson-Jackson dinner; he campaigned also across Texas from Austin to Dallas and Fort Worth through San Antonio;.
He phone-banked for Senator Obama and spoke at several Rock the Vote Bus Tour events.
He also introduced Senator Obama at a dinner in Hickory Hill.
In October 2009, Kennedy announced that he would be endorsing Alan Khazei in the special election to fill the US Senate seat of his late uncle, Ted Kennedy