(msnbc) --- WASHINGTON - Rep. Patrick Kennedy's decision not to seek re-election will leave Washington without a Kennedy in political office for the first time in more than 60 years.
The Rhode Island Democrat said Friday that he wants to focus more on his personal life and plans to continue the work he has done in Congress helping people overcome substance abuse problems. He said he can do the most good for other people in the field of substance abuse recovery.
"There are other things to life, and right now I want to explore them," the 42-year-old son of the late Sen. Edward Kennedy told The Associated Press in a telephone interview.
He said in a television message viewed by the AP on Thursday that his life is "taking a new direction." The video was provided to the AP by Kennedy's congressional office.
Patrick Kennedy says in the video that it has been a difficult few years for many people, and he mentions the death in August of his father.
"Illness took the life of my most cherished mentor and confidante, my ultimate source of spirit and strength," he said, as a black-and-white photo of him as a boy sailing with his father appeared on the screen. "From the countless lives he lifted, to the American promise he helped shape, my father taught me that politics at its very core was about serving others."
The announcement is to air Sunday on Rhode Island television stations.
The decision comes less than a month after a stunning upset by Republican Scott Brown in the race for the Massachusetts Senate seat his father held for almost half a century. Last week, as Brown was sworn into the seat, Patrick Kennedy called Brown's candidacy a "joke" and predicted Brown would betray his union supporters.
Mark Weiner, a major Democratic fundraiser in Rhode Island and one of Kennedy's top financial backers, said he had spoken with Kennedy recently, and that his father's death had taken an enormous toll.
"It's tough to get up and go to work every day when your partner is not there," Weiner said. "I think he just had a broken heart after his father passed away."
Kennedy said in his ad that he remained committed to public service, and he thanked Rhode Island voters for supporting him through ups and downs.
He has been in and out of treatment for substance abuse since crashing his car outside the U.S Capitol in 2006. Still, he has been comfortably re-elected twice since then, after making mental health care his signature issue in Washington.
"When I made missteps or suffered setbacks, you responded not with contempt, but compassion," he said. "Thank you for all the times you lifted me up, pushed me forward and filled my heart with hope."
Kennedy was not specific about his plans, but said he would continue to fight for issues on behalf of those suffering from depression, addiction, autism and post-traumatic stress disorder.
"Now having spent two decades in politics, my life is taking a new direction," Kennedy says.
A Kennedy has served in elected office in Washington ever since Patrick Kennedy's uncle, John F. Kennedy, was elected to Congress from Massachusetts in 1946.
As a member of the powerful House Appropriations Committee, Kennedy has made sure federal dollars are sent to his state.
Democratic Rep. Jim Langevin, Rhode Island's only other House member, had spoken with Kennedy and said he would miss him in Congress.
"Patrick is a true public servant and passionate fighter who made a real difference for the people of our great state," said Langevin, who served with Kennedy in the state House of Representatives.
Kennedy was elected to that position in 1988 at age 21 while still attending Providence College, then was sent to the U.S. House of Representatives in 1994.
Kennedy also has been a financial boon to the Democratic Party, drawing people to fundraisers nationwide, and he once served as chairman of the Democratic Congressional Campaign Committee.
In Congress, Kennedy has pushed for greater mental health care coverage, citing his own struggles with depression and addiction. His mother, Joan Kennedy, has been through several alcohol treatment programs.
A surprise decision
Kennedy has never married, and friends have said his personal life had taken a back seat to his career.
Still, until recently, Kennedy appeared committed to running again.
The only Republican in the race, state Rep. John Loughlin, has been working with Brown's campaign team, the Shawmut Group, and was raising money. But Kennedy was heavily favored to win the race: Registered Democrats outnumber Republicans more than 4 to 1 in Rhode Island. Loughlin has little statewide recognition, and Kennedy had four times as much campaign cash on hand coming into the year.
He told The Providence Journal shortly after Brown's win in January that he wasn't worried about Loughlin, saying "bring it on."
Weiner said Kennedy was not afraid of losing the election.
"Winning or losing had nothing to do, I'm sure, with his decision," he said.
Loughlin said Thursday night that he wished Kennedy well.
"We hope that wherever life takes him beyond his career in Congress that he has good fortune," Loughlin said. "And we're going to stay in the race."
Kennedy son won't run again, marks end of era
