Their job is to oppose. Others are simply being cautious, withholding comment so as to avoid the possibility of being embarrassed by later revelations. The political class is certainly not more moral than Americans beyond the Beltway. It is not new examples of Clinton's womanizing that have created the gap. Rather, the gap existed before Monica Lewinsky and the subsequent fallout.
Recent events are merely the framework on which to hang other discontents.
Some fault Clinton for what he chooses not to do, for failing to respond adequately to the unmet needs of the nation. Others fault him for actions taken. Or, for personal reasons, such as unkept promises or unheeded advice. Or for his management style, flabby by the standards of past administrations. Or for a collection of matters, such as firing respected civil servants in the White House travel office, that are more important to Washingtonians than to folks in Ashtabula or Sheboygan.