For President Clinton, the 19th hole of a golf course often involves a wedding. The First Duffer frequently finds himself at country clubs where nuptials are in progress and, even when sweaty, poses for photos with the happy families. People magazine documents this next week with hilarious pictures.

"I think the temperature was approaching 100 that day, he put his arms around me and I said, Oh, my God,' " Washington engineering executive (and Republican) Michael Kappaz told The Source. His daughter's July wedding at Congressional Country Club was attended by 300 guests, and Clinton dropped right in. "He's a very charming, very magnetic fellow. . . . One of my daughters came up to him and said, Most of the people here didn't vote for you, but you put your arm around them or embrace them. I voted for you. How about a kiss for me?' Of course, he did," Kappaz said. Tony Bennett, Bouncing Back

The last time Tony Bennett came to town, it was spectacular. He arrived at the White House for dinner Dec. 21 and almost immediately doubled over in pain. An ambulance went screaming from 1600 Pennsylvania Ave. to Georgetown University Medical Center, where the crooner had emergency surgery for a hernia.

"And then I had a tremendous recuperation, thanks to Donald Trump," a chipper Bennett said yesterday. "He sent a private plane to bring me from Washington to New York and then down to Mar-a-Lago, where they worked on me at his spa. The White House got me the best doctor. It was like Arabian Nights,' when the magic carpet comes."

What some people will do for attention, huh? The only thing Bennett knows to do for an encore is sing, which he will do tonight and tomorrow with the National Symphony Orchestra at Constitution Hall. The concerts are his first since the surgery, although he spent most of this week shooting a music video with Madonna's brother. Christopher Ciccone is directing Bennett's "God Bless the Child," from his forthcoming album -- his 98th -- of Billie Holiday songs.

He credits his son and manager of 17 years, Danny, with masterminding his huge resurgence in popularity, especially among younger audiences who "go to these places where they drink martinis and dance to Frank Sinatra and myself and Nat King Cole." At 70 and "still learning a lot," Bennett is targeting the "Sesame Street" crowd next.

"The next album is gonna be a children's album," he said. "I'm sketching it out in my head now." NOW YOU KNOW...

Bethesda literary agent Rafe Sagalyn represents many serious authors with serious titles. But every now and then a bombshell comes along. He and Washington attorney Mark London brokered Paula Barbieri's book deal for a reputed $3 million.

Little, Brown and Co. decided to publish the story of O.J. Simpson's ex-girlfriend because editors were struck by Barbieri's "honesty and sensitivity," said publisher Sarah Crichton in a statement yesterday. Little, Brown also published Simpson's blockbuster jail house book, "I Want to Tell You."

"She has a bittersweet story to tell," Sagalyn said yesterday, "and I'm going to leave it right there." He refused to discuss what Little, Brown paid for the unwritten book. Barbieri, a sometime model and actress, left a "Dear O.J." message on Simpson's answering machine the morning before Nicole Brown Simpson and Ron Goldman were stabbed to death, she testified in Simpson's civil trial.

A mere 11 days after the Great Inaugural Cloakroom Caper, Jeffrey Nelson had his Hart, Shaffner and Marx coat returned to his Senate office yesterday. The press secretary for Sen. Ron Wyden (D-Ore.) also was offered his choice of several scarves, he said, "but none of them were mine." The outerwear outrage occurred when a flood of people from three inaugural parties streamed into the coat-check room at the Omni Shoreham on Jan. 20, overwhelming staff.

B-1 Bob must think he's still a member. Former representative Robert Dornan (R-Calif.) rushed into the Dirksen Building Wednesday and slipped right around the metal detector. When a guard called, "Sir," he growled, "Dornan" and kept right on moving.

When last seen, he did not appear to be headed for the office of Loretta Sanchez, the Democrat who replaced him.

Tony Blankley has shifted from Newt to George. The former flack for House Speaker Newt Gingrich becomes an editor-at-large and monthly columnist for George magazine, beginning with the April issue. "I'm still typing," he said of his topic. He's also hitting the lecture circuit -- his first speech is next week in Florida to pension plan managers, for an undisclosed fee, natch.

Blankley is still looking for a TV gig, and, like nearly everyone else in town, he's working on a book.

Former senator Bill Bradley (D-N.J.) has joined the University of Maryland's Academy of Leadership in College Park, where he'll oversee research on social, racial and economic problems. The academy develops political leaders from such under-represented groups as women, the young and minorities. Bradley will chair its board of advisers, for which he'll earn $75,000 a year, reports The Post's Lisa Frazier.

Long considered White House material, Bradley becomes a bi-coastal scholar in September as a Stanford University lecturer. That'll give him a nice California base for Campaign 2000. CAPTION: Barbieri, author-to-be. CAPTION: Bennett, back in D.C. CAPTION: President Clinton gives Michael Kappaz, father of the bride, a sweaty squeeze.