I found this Frank Rich essay in New York magazing to be extremely thoughtful. It is well worth your time. As he writes:
This delusional faith in comity reached its apotheosis in the debt-ceiling showdown. With the reliable exception of Paul Krugman, who shuns Washington and calls centrism “the cult that is destroying America,” almost every Establishment observer in our own time bought into the magical thinking that the radical Republicans would never go so far as to risk a default of the American government. Only when the tea-party cabal in the House took Washington hostage did it fully dawn on the Beltway gentry that the country was in danger.