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Americans have never been so disgusted with their politicians. More than three-quarters of Americans disapprove of Congress. President Barack Obama's favourability ratings have slumped to below 50 per cent and he is no longer trusted or believed by many who voted for him.

Republicans are faring little better and the growth of the Tea Party movement reflects the widespread disgust with Washington and the political class. Incumbents across the board are vulnerable in November's mid-term elections.