For years, they were close political allies and friends. They are nearly the same age and have similar ideas about public policy. They even joined forces four years ago as running mates for governor and lieutenant governor. But nowadays, Andrew M. Cuomo, 49, and Charlie King, 46, are rivals for the Democratic nomination for attorney general. And between the 2002 race and this year's contest, their friendship has withered to a point where they are barely on speaking terms. Indeed, the rift between Mr. Cuomo, housing secretary in the Clinton administration and onetime... --snip-- In the last year, Mr. King...