Sarah Palin, former US vice-presidential candidate, is to be played by the actress Julianne Moore in a film about the 2008 race for the White House.
Although she has been most famously portrayed by the comedienne Tina Fey in the show Saturday Night Live, HBO Films made the more conventional choice of Moore, who starred in "The End of the Affair" and "Far From Heaven", in casting Mrs Palin.
The film "Game Change" is based on Mark Halperin and John Heilemann's book about the 2008 presidential elections and follows Senator John McCain's campaign from his selection of Palin as his running mate to their ultimate defeat at the hands of Barack Obama.
It will be directed by Jay Roach, director of the Meet the Parents movies as well as the HBO film Recount, which chronicled the aftermath of the 2000 presidential election and the disputed Florida recount that delivered the presidency to George W. Bush.
Mrs Palin has yet to decide whether she will run for the White House in 2012. She enjoys fervent support among many hard-core Republican activists but party establishment figures worry that she does not have broader appeal.
Moore is the first member of the cast to be announced with the actors who will play Mr Obama, Mr McCain and Hillary Clinton still to be named.
The book revealed many juicy details of the conflict between Mrs Palin and the staff of Mr McCain. At one point Steve Schmidt, a top McCain aide, was quoted as telling Mrs Palin's team: "You guys have a lot of work to do. She doesn't know anything."
Moore is a prominent Hollywood liberal who backed Mr Obama in the 2008 election.