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Republicans appear increasingly likely to win back the US Senate in November 4 mid-term elections, a move that would heap misery on President Barack Obama in his final two years in office. The more conservative of the main American parties already controls the House of Representatives, and no one seriously predicts Democrats will retake it this year. Republicans are capitalizing on stubbornly persistent frustration with Obama and his policies, particularly in battleground states Democrats must successfully defend if they want to hold the Senate. Despite polls showing Democratic gains in some rollercoaster races, the math favors Republicans in their bid to win the six net seats they need to control the Senate.