Julianne Moore's iPod-Inspired Palin Portrayal

ET was on the appropriately patriotic blue carpet as Julianne Moore -- star of HBO's political movie Game Change -- revealed her secret to achieving her spot-on portrayal of Sarah Palin.

Speaking at the New York premiere of Game Change last night, Moore said she listened to Palin's voice on her iPod to study the former Republican vice presidential candidate's voice and speaking style. "I had her book on tape that she was reading. And I had all of her media appearances, all of the debates, all of the speeches -- everything was on my iPod. So I'd go running to it, I'd listen to it in the car, I had it playing non-stop, basically."

Video: Julianne: 'Game Change' Humanizes Sarah Palin

Of course the most memorable past portrayal of Sarah Palin was Tina Fey's impression of the fiery politician on Saturday Night Live. While Moore called Fey "a brilliant actress and wonderful writer," she said she got involved with Game Change after her guest-starring role on Fey's sitcom 30 Rock, so the two didn't have a chance to swap tips on portraying Palin.

Video: Julianne Moore Becomes Sarah Palin

CBS This Morning co-host Gayle King also weighed in on Fey's hilariously real portrayal of Palin, but said from what she's heard and seen so far, Moore is equally as impressive. "I think we were all so used to Tina Fey playing Sarah Palin, you thought, how can anybody top Tina Fey? But I hear Julianne Moore is a knockout, and from the clips I've seen, I believe it."

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Watch the video to also hear fellow cast member Sarah Paulson talk about her role as senior Palin adviser Nicolle Wallace, and to hear advertising guru Donny Deutsch explain why he is sure that Palin and her former presidential running mate John McCain will be sure to check out Game Change, which premieres Saturday March 10 at 9 p.m. on HBO.