New Hampshire Republicans are set to choose their candidate to take on Democratic Sen. Maggie Hassan on September 13. New Hampshire Republicans running for the Senate nomination are pictured here on the debate stage.
Mandatory Credit:	Mary Schwalm/AP

New Hampshire Republicans are set to choose their candidate to take on Democratic Sen. Maggie Hassan on September 13. New Hampshire Republicans running for the Senate nomination are pictured here on the debate stage.
Mandatory Credit: Mary Schwalm/AP

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New Hampshire's GOP primary will complete the Senate battleground map

New Hampshire Republicans are set to choose their candidate to take on Democratic Sen. Maggie Hassan on Tuesday in a primary that will lock in the final key matchup in November's battle for control of the Senate.