David Brock, the once-right-wing journalist who led an assault on Bill Clinton in the early '90s, is taking the lead in a Democratic attack campaign against John McCain, Politico reports. The Brock-helmed group Progressive Media USA is planning a $40-million media blitz aimed at McCain; the group currently has $7.5 million in commitments.
                                    
                                    
                                
                                
                             
                            
                            
                            
                            
                            
                                
                                
                                    
                                        Brock stepped in after another independent  group, Fund for America, struggled to raise cash to weaken the GOP candidate. “There's a sense of urgency,”  Brock tells Politico. “The question is bringing the money in to say we're ready to go.” Brock is seen as a Hillary Clinton ally, but has also met with Barack Obama supporters. “This is a unity play,” he insists.