Amend the constitution to reflect term limits for the President and all members of Congress to 1 term of 6 years.
Federally elected offices have become a life-long career and as such, electees are no longer beholden to the public that voted them in. By enacting an amendment that no federally-elected official shall serve more than one term of 6 years, accountability will return to politics.
Without the worry of getting re-elected, officials can spend their time working on the issues they promised to their constituency during their campaigns. With a 6-year term, most officials should have enough time to have a significant impact on the issues they've chosen.
Officials would also be less beholden to special interest groups and lobbyists who would have less influence on future campaigns.