In his post-presidential years, Jimmy Carter has been a model of good citizenship, decorum, dignity, and moral and political leadership. He has carried his presidential crusade for human rights into his post-presidential life. See this profile of Carter by Amy Wilentz in New York magazine.
Contrast Carter's life after the White House with that of Bill Clinton, notable for its absence of decorum, dignity, and discipline. See this profile of Clinton by Todd S. Purdum in Vanity Fair magazine.