The twenty years since 1995 have seen their share of landmark events. Among them a contested presidential election result (2000), a terrorist attack on U.S. soil (2001), the beginning of a war in Iraq (2003), economic calamity (2008), the election and reelection of the nation's first African American president (2008, 2012), two changes in party control of the presidency, three changes in party control of the House (including the first Republican majority...