By ELISABETH BUMILLER

WASHINGTON - The thaw in the resentful relationship between the most powerful woman in the Democratic Party and her younger male rival began at the party’s convention this summer, when Senator Hillary Rodham Clinton gave such a passionate speech supporting Senator Barack Obama that his top aides leapt out of their chairs backstage to give her a standing ovation as she swept past.
Mr. Obama, who was in the first steps of what would become a strategic courtship, called afterward to thank her. By then, close aides to Mrs. Clinton said, she had come to respect the campaign Mr. Obama had run against her. At the least, she knew he understood like no one else the brutal strains of their epic primary battle.
By November 20, when Mr. Obama reassured Mrs. Clinton that as secretary of state she would have direct access to him and could select her own staff, the wooing was complete.
“She feels like she’s been treated very well in the way she’s been asked, said a close associate of Mrs. Clinton, who like others interviewed asked for anonymity because the nomination had not yet been announced.
Few are predicting that this new relationship born of mutual respect and selfinterest will grow into a tight bond between the new president and the woman who will be the public face of his foreign policy, though some say it is not impossible. They argue that a close friendship between the two powerful officials is useful but not essential, and is not a predictor of the success of the nation’s chief diplomat.
While James A. Baker III was extraordinarily close to the first President George Bush and is widely considered one of the most successful recent secretaries of state, Dean Acheson was not a friend of Harry S. Truman and Henry A. Kissinger did not particularly like Richard M. Nixon.
“Two of the nation’s greatest secretaries of state in the modern period, Dean Acheson and Henry Kissinger, were not personally close but were intellectually bonded to their presidents, said Walter Isaacson, the author of a biography of Mr. Kissinger and the co-author, with Evan Thomas, of “The Wise Men, a book about America’s postwar foreign policy establishment. “I think that Obama and Clinton could form a perfect partnership based on respect for each other’s view of the world.
In the Obama-Clinton relationship, advisers say, the relatively smooth nature of their talks about the secretary of state job indicate that both, for now, have a working chemistry, despite differences in the campaign on such issues as the Iraq war.
The advisers say that Mr. Obama was clearly interested in bringing a rival under his wing, and that he also recognized that Mrs. Clinton had far more discipline and focus than her husband.
At the same time, Mr. Obama’s advisers said, he had the self-confidence to name a global brand as his emissary to the world. He recognizes, they said, that after January 20, he will have to build the kind of relationship that ensures that foreign leaders know that when Mrs. Clinton speaks, she is speaking directly for him.
“It helps to have a relationship that Bush had with Baker, that’s no doubt true, said Martin Indyk, a former American ambassador to Israel, who was a supporter of Mrs. Clinton in the primary battles. “But if they are seen as working together effectively, I think that can be easily overcome. I don’t think he would have decided to appoint her if he didn’t want her to be effective.
One close adviser to Mr. Obama said the president-elect also saw that Mrs. Clinton’s political skills would serve her well in the job, as happened with Mr. Baker and Mr. Kissinger. “They understood that statecraft is politics by another name, the adviser said.