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In economic terms, it has been a rough summer for the United States. The economy is weak and unemployment remains stubbornly high. Frustration with Washington politics promises to be a huge factor in November's midterm Congressional elections.

Congressman Barney Frank is an influential figure on Capitol Hill. In a special edition of Hardtalk from Boston, Massachusetts, Stephen Sackur talks to him about the Obama presidency so far. He asks: whatever happened to the 'politics of hope'?