All Page Six Stories TOP KERRY DONOR'S MAFIA PAL By Richard Johnson Fri Jul 30, 1:30 AM ET A SCANDAL might be brewing in John Kerry's camp over revelations that his biggest donor, billionaire playboy Steve Bing, has close ties to a Mafia hitman. Bing, who inherited a $600 million real estate fortune courtesy of his grandfather, Leo Bing, has amassed over $16 million for the Democrats. He has donated $8.1 million to groups that are creating and airing anti-George Bush TV ads, according to Variety. Now, ABC News reports that one of Bing's close friends is Dominic Montemarano, a.k.a....