DENVER – The parallels are compelling. They suggest a potential path from here to Nov. 4.

And they will never be more vividly on display than when Barack Obama Thursday night becomes the first presidential nominee to accept his nomination in an outdoor setting since John F. Kennedy's historic 1960 "New Frontier" speech at Los Angeles Memorial Coliseum.

Like JFK, Mr. Obama chose an outdoor venue – the Denver Broncos' Invesco Field – to show that his candidacy extends beyond the politicians and interest-group leaders who have dominated this week's convention proceedings.

But the comparisons extend beyond surface settings.

Like JFK, Mr. Obama is seen by friends as a dynamic, charismatic leader and by foes as too young and inexperienced, with elitist tendencies. Like JFK, he had to surmount establishment resistance amid internal divisions still evident at his convention.

Like JFK, he's a Northern Democratic senator seeking to end two Republican terms. Like JFK, his goals include issues – health care and energy – on which political gridlock has stalled action.

Like JFK, his running mate is a well-regarded, veteran senator with some controversial aspects.

Like JFK, his prospects face potential pitfalls difficult to measure because the nation has never elected an African-American, as it had not elected a Roman Catholic before Mr. Kennedy.

Like JFK, he faces a sub-rosa negative campaign with misleading elements and racial stereotypes. I still recall the literature segregationist groups used against Mr. Kennedy, hardly a civil-rights firebrand.

And like JFK, who spoke after an emotional reception for Sen. Eugene McCarthy's speech extolling Adlai Stevenson, Mr. Obama follows Tuesday's fervent presentation by Hillary Clinton and Wednesday's appearance of her husband, former President Bill Clinton.

Still, Mr. Obama's oratorical skills and 75,000 cheering supporters should make tonight's speech a short-term success, assuming a good weather forecast holds up.

Some veterans of 1960 remember a half-filled Coliseum and bad acoustics. Yet Mr. Kennedy's speech galvanized his candidacy and launched the phrase that came to symbolize his presidency.

Already, there have been several Kennedy-Obama references, starting with Monday night's speech in which JFK's daughter, Caroline, introduced his sole surviving brother, Sen. Edward Kennedy.

"Everywhere I go in this country," she said, "people tell me that Barack Obama is making them feel hopeful the way they did when my father was president."

Her aging, ailing uncle underscored that by echoing one of JFK's signature phrases, declaring that, with Mr. Obama, "The torch will be passed again to a new generation of Americans."

On Tuesday, Ted Sorenson, President Kennedy's closest adviser, made an even more direct comparison, hailing Mr. Obama as someone who could match the late president's "intellect and integrity, his capacity to inspire justice at home and peace around the world."

But the real test of Mr. Obama's speech, and this entire convention, won't be at Invesco but with the viewing audience, especially many still uncertain about his candidacy. That group's reaction to his speech and the upcoming televised debates is likely to determine if this 47-year-old senator can satisfy doubts about his readiness and ride a looming Democratic tide into the White House.

His task, evident in recent polls, was illustrated Sunday at pollster Frank Luntz's focus group with two dozen undecided Colorado voters. Many described Mr. Obama as inexperienced, even "scary," saying they had no clear sense how he would implement "change."

"Give me some specifics on those dreams that you have," said Doug Mangels, 48, a firefighter and single father of three.

"Make me believe there is substance behind your charismatic rhetoric," added Lori Miller, 46, a married mother of three and financial services administrator.

The Kennedy experience suggests that even after tonight, many doubts will remain.

After all, Mr. Kennedy needed his historic Houston speech on the separation of church and state, a strong performance in the first televised debates and a last-minute call to an imprisoned Martin Luther King Jr. to win a narrow victory.

That suggests that, even with a strong debate performance, which is not guaranteed, Mr. Obama may need all of his oratorical skills and the millions being spent to generate massive turnout to complete his historic quest.

Carl P. Leubsdorf is Washington Bureau chief of The Dallas Morning News. His e-mail address is cleubsdorf@dallasnews.com.