Thomas E. Mann — American Sociologist born on September 10, 1944,

Thomas E. Mann is the W. Averell Harriman Chair and a senior fellow in Governance Studies at the Brookings Institution. He primarily studies and speaks on elections in the United States, campaign finance reform, Senate and filibuster reform, Congress, redistricting, and political polarization... (wikipedia)

The country has sorted itself ideologically into the two political parties, and those partisan attachments have hardened in recent years. It will take an extraordinary event and act of leadership to break this partisan divide. I thought 9/11 might provide such an opportunity, but it was not seized.
Redistricting is a deeply political process, with incumbents actively seeking to minimize the risk to themselves (via bipartisan gerrymanders) or to gain additional seats for their party (via partisan gerrymanders).
Mandates are not objective realities but subjective interpretations of elections sold successfully by the winning candidate or party.
Presidents are elected not by direct popular vote but by 538 members of the Electoral College.
Party and ideology routinely trump institutional interests and responsibilities. Regular order - the set of rules, norms and traditions designed to ensure a fair and transparent process - was the first casualty. The results: No serious deliberation. No meaningful oversight of the executive. A culture of corruption.