Too many public servants are afraid to blow the whistle when they spot terrible waste or wrongdoing in government. Other public employees, such as Linda Tripp, seek to expose government for self- promotion or partisanship. W. Mark Felt falls into an entirely different and dignified category. Felt, revealed this week as Deep Throat from the Watergate scandal, showed through his actions more than 30 years ago and by his silence until now concern for his country and an urge to do what is right. As the No. 2 man at the FBI, Felt had so much to lose and took...