Vince Vaughn as, um, former Treasury Secretary Paul O’Neill? Casting begins for Paul Haggis’ film version of Against All Enemies, with Sean Penn purportedly up for the Richard Clarke role. Does that mean we’ll get the rest of the Frat Pack playing Dubya admin officials? Ben Stiller as Ari Fleischer, Owen Wilson as Scooter Libby, and I think we can all guess where Will Ferrell would fit in…