SHREVEPORT, La. - It's a conversation any father and son might have -- a quick chat about baseball, families and world affairs. But when the speakers are President George .W. Bush and his son George W. Bush, even a seemingly innocuous conversation can suddenly carry great weight, especially when Oliver Stone is at the controls.

With sweat cascading down his face on a steamy June night in Louisiana, the Oscar-winning director was directing James Cromwell (playing the elder Bush) and Josh Brolin (starring as the current president) through a critical moment in "W.," Stone's forthcoming -- and potentially divisive -- drama about the personal, political and psychological evolution of the current president. Although the father-son patter was ostensibly friendly, the subtext was anything but, hinting at the intricate parent-child relationship that Stone believes helps to explain George W. Bush's ascent.

While the Bushes in this scene from 1990 were talking about the Texas Rangers (of whom George W. once owned a share) and Saddam Hussein (against whom George .W. was about to go to war in Kuwait), there was much more at stake, as Stone and screenwriter Stanley Weiser saw the fictional conversation unfolding.

"You need to back him down and take him out -- like you did Noriega," George W. tells his father about Saddam.

The elder Bush wasn't sure he was going to be that rash. "You know I've always believed in leaving personal feelings out of politics," the 41st president tells his son.

As the architect of the outspoken dramas "Platoon," "Salvador," "Wall Street," "Born on the Fourth of July" and "JFK," Stone stands apart as one of the most openly political filmmakers in a business where it's usually the actors who wear their beliefs on their sleeves. A longtime backer of Democratic candidates (recent donations include a gift to Sen. Barack Obama), Stone is either the oddest person to chronicle the life of the current president or the most inspired.

Indeed, "W.'s" combination of story and filmmaker and the poor track record of recent biographical movies scared off at least three potential studio distributors and any number of actors, including, initially, star Brolin, and even Major League Baseball, which declined to cooperate with the production. (In addition to Cromwell, the cast includes Elizabeth Banks as Laura Bush, Richard Dreyfuss as Dick Cheney, Toby Jones as Karl Rove and Scott Glenn as Donald Rumsfeld.)

Yet as Stone guided Cromwell and Brolin across Shreveport's Independence Bowl stadium, doubling for the Rangers' home field, it was possible to see that "W." could be, in a complicated way, sympathetic.

Stone said part of what drove the younger Bush into the White House was the desire to prove his doubters wrong. "Someone who could step into that path and out-father his father," Stone said in his air-conditioned trailer during a break in filming. Even though it was nearly midnight and the crew was just finishing its lunch break, the 61-year-old director grew increasingly animated talking about "W."

"I love Michael Moore, but I didn't want to make that kind of movie," Stone said of "Fahrenheit 9/11." "W.," he said, "isn't an overly serious movie, but it is a serious subject. It's a Shakespearean story. ... I see it as the strange unfolding of American democracy as I have lived it."

Stone, Brolin and the filmmaking team believe they are crafting a biography so honest that loyal Republicans and the Bushes themselves might see it. Given Stone's filmmaking history, coupled with a sneak peek at an early "W." screenplay draft, that prediction looks like wishful thinking.

Stone, who was briefly a Yale classmate of Bush, is clearly no fan of the president's politics but said he's amazed by the man's resilience and ambition. The movie is basically divided into three acts: Bush's hard-living youth, his personal and religious conversion, and finally his first term in the Oval Office.

"We are trying to walk in the footsteps of W. and try to feel like he does, to try to get inside his head. But it's never meant to demean him," Stone said.