NEW YORK, MAY 16: The way Sohale Siddiqi remembers it, he and his old roommate were walking his pug Charlie on Broadway when a large, scary bum approached them, stomping on the ground near the dog’s head.

This was in the 1980s, a time when New York was a fearful place beset by drugs and crime, when the street smart knew that the best way to handle the city’s derelicts was to avoid them entirely. But Siddiqi was angry and he confronted the man, who approached him menacingly.

Until his skinny, elite univerity-educated friend — Barack Obama — intervened.

He “stepped right in between. . . . He planted his face firmly in the face of the guy. ‘Hey, hey, hey.’ And the guy backpedaled and we kept walking,” Siddiqi recalls.

There was a time before Obama wore tailored suits — when his wardrobe consisted of $5 military-surplus khakis and used leather jackets, and he walked the streets of Manhattan for lack of bus fare. It was a time well before the political arena beckoned, when his friends thought he might become a writer or a lawyer, but certainly not the first black man with a real chance to become president of the United States.

Obama spent the six years between 1979 and 1985 at Occidental College in Los Angeles and then in New York at olumbia University and in the workplace. His memoir, Dreams from My Father, talks about this time, but not in great detail; Siddiqi, for example, is identified only as “Sadik” — “a short, well-built Pakistani” who smoked marijuana, snorted cocaine and liked to party.

Sadik now raises money for a community theater.

Together, the recollections of Siddiqi and other friends and acquaintances from Obama’s college years paint a portrait of the candidate as a young man.

They remember a good student with a sharp mind and unshakable integrity, a young man who already had a passion for the underprivileged. Some described the young Obama’s personality as confident to the point of arrogance, a criticism that would emerge decades later, during the campaign.

Obama had an international circle of friends — “a real eclectic sort of group,” says Vinai Thummalapally, who himself came from Hyderabad, India.

As a freshman, he quickly became friends with Mohammed Hasan Chandoo and Wahid Hamid, two wealthy Pakistanis.

The friends got together often to watch basketball games — they were Los Angeles Lakers fans — and eat the southern Indian food that Thummalapally cooked with his cousin.

Thummalapally lived with Obama the summer of 1980. The two ran together daily, three miles in the early morning, often chatting about their dreams. Thummalapally wanted to start a business back home; Obama talked about helping people.

In 1981, Obama transferred from Occidental to Columbia. In between, he traveled to Pakistan — a trip that enhanced his foreign policy qualifications, he maintained in a private speech at a San Francisco fundraiser last month. Obama spent “about three weeks” in Pakistan, traveling with Hamid and staying in Karachi with Chandoo’s family, said Bill Burton, Obama’s press secretary.

When Obama arrived in New York, he already knew Siddiqi — a friend of Chandoo’s and Hamid’s from Karachi who had visited Los Angeles. Looking back, Siddiqi acknowledges that he and Obama were an odd couple. Siddiqi would mock Obama’s idealism — he just wanted to make a lot of money and buy things, while Obama wanted to help the poor.

Siddiqi and Obama lived together in an apartment that was “a slum of a place” in a drug-ridden neighborhood filled with gunshots, he said. “It wasn’t a comfortable existence. We were slumming it.” What little furniture they had was found on the street, and guests would have to hold their dinner plates in their laps.