Thomas Mann of the Brookings Institution and Norman Ornstein of the American Enterprise Institute have a new book "The Broken Branch: How Congress Is Failing America and How to Get It Back on Track." Mann: Partisanship particularly increased after the 1994 elections and … now it is tribal warfare. The consequences are deadly serious. Party and ideology routinely trump institutional interests and responsibilities. The results: No serious deliberation. No meaningful oversight of the executive. A culture of corruption and grievously flawed policy formulation and implementation. Read more here.