Jesse Helms, the former North Carolina senator whose courtly manner and mossy drawl barely masked a hard-edged conservatism that opposed civil rights, gay rights, foreign aid and modern art, died early yesterday. He was 86.

Mr. Helms' former chief of staff, James W.C. Broughton, said the senator died at the Mayview Convalescent Center in Raleigh, where he had lived for the last several years. Mr. Helms had been in "a period of declining health" recently, Mr. Broughton said.

In a 52-year political career that ended with his retirement from the Senate in 2002, Mr. Helms became a beacon for the right wing of American politics, a lightning rod for the left and, often, a mighty pain for presidents whatever their political leaning.

Former President Ronald Reagan, a friend who could thank Mr. Helms for critical campaign help, once described him as a "thorn in my side." Mr. Helms was known for taking on anyone, even leaders of his own party, who strayed from his idea of ideological purity.

"I didn't come to Washington to be a yes man for any president, Democrat or Republican," he said in a 1989 interview. "I didn't come to Washington to get along and win any popularity contests."

Perhaps his most visible accomplishments in the Senate came two decades apart. One was a 1996 measure that tightened trade sanctions against the Marxist government of Fidel Castro in Cuba. The other, a 1973 amendment to the Foreign Assistance Act, prevented U.S. aid money from going to international family planning organizations that, in his words, "provide or promote" abortion. He also introduced amendments to reduce or eliminate funds for foreign aid, welfare programs and the arts.

American Conservative Union Chairman David A. Keene recently said Mr. Helms' contribution to the conservative movement was "incredibly important." For one thing, he said, Mr. Helms was alert to technological change, especially the importance of direct mail, and readily signed fundraising letters that helped conservative organizations get started.

Mr. Helms was also instrumental in keeping Mr. Reagan's presidential campaign alive in 1976, when it was broke and limping after a series of defeats in the GOP primaries.

And in the Senate, Mr. Keene said, Mr. Helms was a rallying point for conservatives. As Foreign Relations Committee chairman, he supported Mr. Reagan on issues like aid to the Nicaraguan Contras. "Without Jesse, it would have been hard for Reagan to hold the line," he said.

Mr. Helms saw himself as a simple man -- he even used the word "redneck" to describe himself -- protecting simple American values from the onslaught of permissiveness, foreign influence and moral relativism.

He liked his art uncomplicated. "The self-proclaimed, self-anointed art experts would scoff and say, 'Oooh, terrible,' but I like beautiful things, not modern art," he told The New York Times in 1989, during a pitched battle over federal subsidies for the arts.

In the 1980s, he took on the National Endowment for the Arts for subsidizing art that he found offensive, chiefly that of photographer Robert Mapplethorpe, who explored gay themes in some of his work, and of artist Andres Serrano, who depicted a crucifix submerged in urine.

He was also well known for holding up votes on treaties and appointments to win a point. His willingness to block Senate business or the will of presidents earned him the sobriquet "Senator No" -- a label he relished.

In campaigns and in the Senate, Mr. Helms stood out in both his words and his tactics.

He fought bitterly against federal aid for AIDS research and treatment, saying the disease resulted from "unnatural" and "disgusting" homosexual behavior.

"Nothing positive happened to Sodom and Gomorrah," he said, "and nothing positive is likely to happen to America if our people succumb to the drumbeats of support for the homosexual lifestyle."

In his last year in the Senate, he decided to support AIDS measures in Africa, where heterosexual transmission of the disease is most common.

Trailing in a tough re-election fight in 1990 against a black opponent, former Charlotte Mayor Harvey Gantt, Mr. Helms unveiled a nakedly racial campaign ad in which a pair of hands belonging to a white job-seeker crumpled a rejection slip as an announcer explained that the job had been given to an unqualified member of a minority. Mr. Helms went on to victory.

In 1994, angered at then-President Bill Clinton, Mr. Helms suggested in print that if Mr. Clinton was to visit North Carolina, "he'd better bring a bodyguard."

He later said the remark had been "a mistake."

His bruising style and right-wing politics won him many friends in his home state and across the nation, but he also created a legion of enemies.

Millions of dollars were raised outside North Carolina both from those who flocked to his ideological banner and from those who ached to see him defeated.

He never won more than 55 percent of the vote in five campaigns for the Senate.

"He was a very polarizing politician," said Ferrell Guillory, a veteran North Carolina journalist. "He was not a consensus builder. He didn't want everybody to vote for him. He just wanted enough."

But as tough as he could be in the political theater, Mr. Helms could exhibit a softer, warmer, even impish side in his personal dealings, even with political adversaries.

In 1963, after 21 years of marriage, Mr. Helms and his wife, Dorothy, adopted a disabled child, Charles, after they read a newspaper article in which the child, who was nine at the time, plaintively said he wanted a mother and father for Christmas.

Jesse Alexander Helms Jr. was born to Jesse Sr. and Ethel Mae Mr. Helms on Oct. 18, 1921 in Monroe, N.C., where his father was chief of police. A hamlet in the North Carolina Piedmont, Monroe embodied the kind of small-town virtue that he would vigorously promote throughout his career.

For Mr. Helms, the orderliness of the small town even encompassed racial segregation; as a child, he saw it not as a great evil but as an accepted part of his world.

Mr. Helms always insisted that journalism had been his first choice for a career. He quit Wake Forest College before he graduated to become a reporter for The Raleigh Times. In 1942, he married the former Dorothy Coble, of Raleigh, whom he had met at Wake Forest.

He is survived by his wife, Dorothy, and three children, Jane Helms Knox of Raleigh; Nancy Helms Grigg of Chapel Hill, and Charles Helms, of Winston-Salem, N.C. He is also survived by seven grandchildren and one great-grandchild.