HOUSTON -- As a little boy, George Bush was so conscientious about offering to share whatever he had with playmates, his family called him "Have-half."
The trait was the beginning of a lifelong habit of showering people with so many courtesies and attentions that Mr. Bush has built a wider and more loyal network of buddies, pals, companions, admirers and friends than most if not all of his Oval Office predecessors.
But as he arrived here yesterday to formally begin his uphill battle for re-election, he was girding himself for combat with Democrat Bill Clinton by drawing on the less likable side of his personality.
In order to repeat the tough, focused, sharp-edged -- some would say ruthless -- campaign he waged against Michael S. Dukakis in 1988, Mr. Bush has to fix on Mr. Clinton in his own mind as the personification of something threatening, evil or unworthy.
"It's all personal with Bush," said Richard Ben Cramer, a former Baltimore Sun reporter who studied the president's style in painstaking detail for his book "What It Takes: The Way to the White House."
"He has to make Clinton into a bully," Mr. Cramer said. "A bully can be dealt with."
Mr. Bush had clearly begun to regard Mr. Clinton as an enemy by yesterday morning when in a speech to a veterans convention in Indianapolis he made thinly veiled references to charges that his opponent evaded the draft in order to escape service in Vietnam.
"That war was controversial; many refused to serve," the president noted as he paid tribute to Vietnam veterans in his audience. Then he went on to recall in detail his own experience as a pilot shot down in World War II.
"I understand right in here what makes military service so special," he said, touching his heart. "Military service is a greater leveler."
Later, before a rally of several thousand supporters, Mr. Bush explained: "In politics, I've always done better when I fight back."
Election campaigns are not about issues or philosophy for Mr. Bush, who at 68 is facing the last hurrah of a political career that began in this city 30 years ago. That's one of the reasons he's always had such trouble articulating what he wants to do in office other than his best.
"Government service is a high public calling for him," observed ,, Sheila Tate, Mr. Bush's campaign press secretary in 1988. It's something his father, the late Sen. Prescott Bush of Connecticut, taught him: people like themselves who have been lucky in their financial circumstances should give back to the country.
But serving in office has almost nothing to do with running for office as far as Mr. Bush is concerned, Ms. Tate said. "It's like two different sides of his brain," she said.
He runs because he wants to serve -- thinks he should serve -- and he works himself up to the challenge of competition by repressing his instinctive friendliness in order to get angry at the other guy.
"He says things to himself like, 'Who does that guy think he is? He's not qualified to be president,' " said Vic Gold, a Washington writer and longtime friend who helped Mr. Bush write his autobiography. "He can get very, very tough then and justify being tough."
The same phenomenon was at work to an extreme degree when Mr. Bush prepared himself to order U.S. soldiers into war to evict invading Iraqi forces from Kuwait. He made it a personal crusade against Saddam Hussein, whom he publicly compared with Hitler.
It is telling that the Serbian leaders who have been accused of running death camps in Bosnia have not yet rated such a characterization from the president. He's been much more reluctant to commit U.S. military force there.
The "have-half," make-friends side of the president's personality appears to be dominant. It was much in evidence during the first
three years of his term.
Mr. Bush took such obvious delight in finally winning the job he'd been groomed for all his life he seemed to want every one to share his good fortune. He invited more than 200 members of his extended family to a White House party his first weekend in office and kept the social schedule going non-stop thereafter.
Reporters got to ride in his armored limousine to go jogging with him; members of Congress were allowed to bounce on the Lincoln Bed. Friends, foreign leaders and movies stars spent the weekend with him at Camp David.
The White House staff of butlers, gardeners and maintenance workers were included in an annual horseshoe pitching tournament for which the president himself made up the team rosters and scheduled the matches.
At his vacation home in Kennebunkport, Maine, new acquaintances from his presidential life -- most recently Israeli Prime Yitzhak Rabin -- were encouraged to sample two of his favorite pleasures: inspecting the wonders of marine life along the seacoast and feeling the exhilarating rush of a ride in his powerful speedboat, Fidelity.