The billionaire media mogul is a supporter and family friend of the Obamas, but has given no indication she’s interested in participating in the enrollment push that is set to begin this fall.

That said, the White House is aggressively tapping its network of allies in Hollywood as it looks to drum up publicity for ObamaCare, with Oprah among the most powerful supporters of all.

Marketing experts say her involvement would be a game-changer.

“She has one of the most powerful brands in America,” said Allen Adamson, managing director at brand consulting firm Landor Associates.

“If the White House isn’t calling her, they should be.”