That horse and another gate

One of my favourite films is All the President's Men, based on the book by Washington Post journalists Carl Bernstein and Bob Woodward. It tells the story of their investigation into the Watergate break-in and the subsequent resignation of President Richard Nixon to avoid impeachment. 

Subsequent political scandals have since acquired the suffix -gate and the phone hacking scandal at News International is no different.  The revelation that David Cameron rode an ex-Metropolitan Police horse belonging to his friend, ex-Eton classmate and now racing trainer Charlie Brooks and his wife,  former News of the World editor Rebekah Brooks - both of whom were arrested and released on police bail yesterday - summed up the corrupt connections between the police, politicians and News International and has led to the affair being dubbed Horsegate.

Surely a film will eventually be made about the phone hacking hacking scandal but who could possibly play the main characters?  Richard E Grant as Cameron? Dustin Hoffman as Nick Davies of The Guardian? I'm struggling with Rupert Murdoch and Rebekah Brooks to be honest.