Since 2006, New Hampshire's two House seats have been ping pong balls, bouncing back and forth between the parties three times in unison. The reason for this volatility? New Hampshire's huge share of independents, who don't adhere strongly to either party and take out their frustrations often. Both Democratic Reps. Carol Shea-Porter (NH-01) and Annie Kuster (NH-02) are at risk again, but first the GOP must deal with competitive - and quite late - September primaries.NH-01: Carol Shea-Porter (D) - East: Manchester, PortsmouthToss Up. This eastern New Hampshire seat is beginning to look awfully like a ping pong ball. In 2006, amid anger about the direction of the Iraq War, liberal activist Shea-Porter won it by a hair in a huge upset. When independents swung violently towards Republicans in 2010, Shea-Porter lost it to former Manchester Mayor Frank Guinta. In 2012, amid high turnout for President Obama, Shea-Porter won it back. Now Guinta is interested in a rematch, but he has to first get past a primary from UNH business school dean Dan Innis.By the numbers, this is the less

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