JOHN Kerry's choice of John Edwards as his vice presidential candidate is getting predictable but sincere applause from Democrats, relieved that some charisma will enliven their presidential ticket. But the initial positive reaction may not last long as the Bush campaign zeroes in on Edwards' vulnerability: his presidential campaign contributors. During his run for the top job, John Edwards relied heavily on leading trial lawyers. Twenty-two of his top 25 donors were trial attorneys. And those donations likely cloak a multitude of sins and violations of the campaign-finance laws.