Most polls suggest that Republicans will capture a narrow majority in the Senate in November's midterm elections, while holding on to the House of Representatives. So America faces two more years of divided government, but with a shift in the balance of power. Until now, Barack Obama has always had a Democratic Senate to block proposals passed by the House. If that buffer disappears, he will have to sign or veto every bill that a Republican Congress sends him. The result may be political paralysis, accelerating the greying of the president's hair and alarming allies worldwide. Or it may be that the two sides find common ground and pass some sensible measures.
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