Throughout his life, John F. Kennedy was lucky–both personally and politically.

Part of the secret lay in his physical presence.  He was young and handsome, witty and articulate.  He appeared zestful and athletic–despite a series of ailments, including Addison’s disease (a malfunction of the adrenal glands) and an injured back that required the use of a brace.

John F. Kennedy fired the imaginations and captured the hearts of Americans and foreign citizens as no President since the days of Franklin D. Roosevelt.

Millions who voted for him–or against him or didn’t vote at all–still believe that, if only he had lived to be re-elected, America would have entered a truly Golden Age.

Kennedy certainly encouraged such belief.  Asked for his definition of happiness, he quoted the ancient Greeks: “The full use of your powers along lines of excellence.”

Almost 50 years after his death on November 22, 1963, he remains frozen in time.  Assassinated at age 46, he remains forever young, vigorous and charming.

But even if he had not been assassinated, his Presidency could have ended in disaster.

After his 1953 marriage to Jaqueline Bouvier, he continued to pursue both a married and a bachelor life.  Rumors of Kennedy’s extramarital affairs swirled throughout his Senatorial career and followed him into the White House.

His conquests included secretaries, wives of friends, strippers, movie stars (such as Marilyn Monroe and Marlene Dietrich) prostitutes and even a mobster’s mistress.

Various theories have been advanced for his taking such dangerous risks with his political career:

• As a victim of Addison’s Disease (insufficiency of the adrenal glands) he had been told by doctors he might not live beyond 35.
• As a result of the cortisone he took to control his Addison’s, his libido was greatly enhanced.
• After escaping death with the sinking of PT-109, he decided to cram as much excitement into his life as possible.
• His father, Joseph P. Kennedy, Sr., a notorious womanizer, had encouraged him and his three other sons to sleep with as many women as possible.

During the 1960 Presidential campaign, Frank Sinatra–who had become smitten with Kennedy and was determined to see him elected–introduced him to a “good time girl” named Judith Campbell.

Judith Campbell

Whether Kennedy knew it or not, Campbell was also sleeping with Sam Giancana–the most-feared Mafia boss in Chicago.  And it wasn’t long before Giancana learned about her trysts with Kennedy.

As a favor to Sinatra, Giancana and his fellow mobsters used their powerful influence to ensure that JFK carried Illinois in 1960.

Sam Giancana

In turn, Joseph P. Kennedy had promised Giancana that the Mob would get a free ride under a Kennedy Presidency.

When JFK appointed his brother, Robert, Attorney General, the latter declared war on organized crime.  Giancana and his fellow hoods felt betrayed.

Giancana often raged to Campbell: “If it wasn’t for me, your boyfriend wouldn’t be President.”  And having knowledge of her scandalous relationship with JFK, Giancana was in a position to expose Kennedy to what would be a shocked public.

And if Giancana didn’t do it, FBI Director J. Edgar Hoover might.

John F. Kennedy, J. Edgar Hoover and Robert F. Kennedy

Hoover, under relentless pressure from Robert Kennedy to crack down on the Mob, had, through illegal electronic surveillance, discovered the Giancana-Campbell-Kennedy connection.

Always fearful that he might be replaced as FBI director, Hoover had quickly alerted the Attorney General to his latest discovery in February, 1962.  Kennedy could not dare fire Hoover now.

White House telephone logs reveal that, from January, 1961 until February, 1962, Campbell phoned the White House 70 times.

After Hoover informed Robert Kennedy of Campbell’s status with the President, she made only one more call to Kennedy.  It was then that the President said the affair was over.

Similarly, the President’s on-and-off affair with Marilyn Monroe put him in an equally dangerous position.  As Monroe’s behavior–fueled by emotional instability, alcohol and pills–became increasingly erratic, she grew convinced that Kennedy should divorce Jackie and make her the next First Lady.

Rumors still circulate that the President sent Robert Kennedy–who was by now an old hand at cleaning up JFK’s messes–to tell Monroe their relationship was over.

Whatever secrets Monroe may have been able to reveal about her relationship with Kennedy, she took them to the grave in an overdose of alcohol and sleeping pills on August 5, 1962.

In his 1995 bestseller, The Dark Side of Camelot, investigative reporter Seymour Hersh got several former members of Kennedy’s Secret Service detail to speak about JFK’s extramarital sex life.

They revealed that they had not been allowed to search any of the women Kennedy cavorted with.  Any of these women could have injected the President with a poisonous hypodermic.  Or secretly tape recorded their trysts with Kennedy for blackmail purposes.

Kennedy believed he would be re-elected in 1964–especially if his opponent was Barry Goldwater, the Republican Senator from Arizona.

And he almost certainly would have been re-elected; Lyndon Johnson scored a smashing victory over Goldwater.

But it’s also possible that Kennedy could have been forced to resign in disgrace over his affairs with Campbell, Monroe or any number of other women.

Such a fate overtook British Secretary of State for War John Profumo in 1962.  In 1961, he had begun an affair with Christine Keeler, an attractive model.  But Keeler was also bedding Yevgeney Ivanov, the senior naval attaché at the Soviet Embassy in Britain.

When the press learned about the threesome, Profumo was forced to resign, his 22-year political career destroyed.

President Kennedy’s untimely death has since fueled arguments over how, if he had lived, he would have dealt with Vietnam.

In his memoirs, former Soviet Premier Nikita Khrushchev wrote: “Kennedy would have never let his country get bogged down in Vietnam.”

But David Halberstam, who covered the early years of the war for The New York Times, came to a different conclusion.

David Halberstam in Vietnam

In his bestselling 1972 book, The Best and the Brightest, he wrote that although he Kennedy questioned the wisdom of a combat commitment, he had never shown those doubts in public.

In public, he had expressed doubts only about the Diem regime–whether it held enough support among the Vietnamese to win the war.

His successor had to deal with Kennedy’s public statements, all supportive of the importance of Vietnam.

And it was that successor, newly-elevated President Lyndon B. Johnson, who decided, in 1965, to commit heavy military forces to protecting “freedom-loving” South Vietnam.

In short: Even if Kennedy had intended to withdraw American forces after winning re-election in 1964, he made a fatal mistake: He assumed there would always be time for him to do so.

Historian Thurston Clarke, in his 2013 book JFK’s Last Hundred Days, reached a totally diferent conclusion: That Kennedy planned to quietly remove American military advisors regardless of the military situation.

Like Halberstam, Clarke believes that Kennedy intended to gradually withdraw troops from Vietnam–but felt he could not afford to inflame the Right during an election year.

Essentially, the question, “What would  Kennedy have done?”–on Vietnam, civil rights, relations with the Soviet Union–lies at the heart of his continuing fascination among Americans.

For millions, the later turmoil of the 1960s remains such a traumatic memory that they assume: “America would have had to be better-off if Kennedy had lived.”

But much of Kennedy’s proposed legislation–such as his civil rights act–did not become law until President Johnson overcame conservative opposition to it.

Johnson had first been elected to the House of Representatives in 1937, where he gained influence as a protege of its speaker, Sam Rayburn.  In 1948, he was elected to the U.S. Senate and eventually became  one of its most powerful members–especially after becoming its Majority Leader in 1954.

Johnson knew the strengths and weaknesses of his political colleagues, and he ruthlessly exploited this knowledge to ensure the passage of legislation he supported.

Kennedy had served in the House from 1946 to 1952, and from 1952 to 1961 in the Senate.  But he had never been a major leader in either body.

It was as a Senator that he wrote his Pulitzer Prize-winning book, Profiles in Courage.  But it was also as a Senator that he refused to vote on whether U.S. Senator Joseph R. McCarthy should be censured by his Senatorial colleagues.

In 1954, the Senate voted to condemn McCarthy, whose slanders of Communist subversion had bullied and frightened Americans for four years.  McCarthy’s influence as a political figure died overnight.

Joseph P. Kennedy, the family patriarch, was a strong McCarthy supporters   And Robert F. Kennedy had briefly worked for McCarthy’s Red-baiting Senate subcommitee.

JFK’s refusal to say how he would have voted on censuring McCarthy damaged his support among liberals during the 1960 election.

Eleanor Roosevelt famously said that Kennedy should show “more courage and less profile.”

Although Lyndon Johnson’s legislative achievements as Senator and President remain unprecedented, he has become a pariah figure among Democrats.

His 1965 decision to wage all-ou war in Vietnam ignited nationwide protests and elected Richard M. Nixon as President in 1968.

Like a doomed character in George Orwell’s novel, 1984, he has largely become an un-person.

Meanwhile, John F. Kennedy continues to endlessly fascinate Americans.  In poll after poll they continue to rate him highly–even though he served less than three years in the White House.

Hundreds of books and thousands of articles have been written about JFK.  On the big screen he’s been depicted by actors such as Cliff Robertson (PT 109), Bruce Greenwood (Thirteen Days) and James Marsden (The Butler).

Movie poster for PT-109

On TV, he’s been portrayed by William Devane (The Missiles of October), William Petersen (The Rat Pack), Martin Sheen (Kennedy), James Franciscus (Jaqueline Bouvier Kennedy) and Cliff De Young (Robert Kennedy and His Times).

William Devane as John F. Kennedy in The Missiles of October

Kennedy has even appeared on Saturday Night Live (perhaps most famously in a sketch where he chides then-President Clinton for his twadry choices as a womanizer).

He even figured in a 1986 episode of the revised Twilight Zone episode where a history professor travels back in time to prevent the JFK assassination.

The result: JFK is saved but Soviet Premier Nikita Khrushchev is murdered and World War III erupts.

In fact, the Internet Movie Database lists a total of 94 movies, mini-series. TV dramas and even comedies featuring the character of John F. Kennedy.