How Congress has dealt with sex scandals has changed over time. The big issues for Rep. Weiner include whether there was an abuse of office or any use of official resources.
Senate Republicans blocked a campaign finance bill that would require special interest groups running campaign ads to identify their donors. Republicans dismissed Democratic efforts as a midterm election ploy.
Former House majority leader Tom DeLay was not charged in a federal investigation into ties with convicted lobbyist Jack Abramoff. But he faces a Texas indictment for violating campaign-finance laws.