"There's no major white roles in it at all. ... I showed it to all of them and they said, 'No, we don't know how to market a movie like this,'" Lucas told Jon Stewart on "The Daily Show."
"The real issue," Barnes told ABCNews.com, "is that primary decision makers in Hollywood tend to be white males, and the natural tendency is going to be to put themselves at the center of the universe."
But both Barnes and Bulluck see this changing with the shift in U.S. demographics.
"What has to happen is for the next generation of artists to grow up in the Obama America," Barnes said.
"We talk about the new coalition that came about in the last two elections, but it's not just in voting. It's the new market," Bulluck said. "I think Hollywood is paying attention and understands the significance of the market."
And, as things go in Hollywood, when a film does well, then Hollywood tries to make more of the same.
"Part of the reason we're going to see the new Jackie Robinson movie '42' this year is because of the success of 'The Help,'" Bulluck said. "With the success of 'Lincoln,' maybe we will see the Frederick Douglass or Harriet Tubman story."