PORTSMOUTH, N.H. - Scott Brown is announcing his run for U.S. Senate at a campaign event Thursday night.
The former Massachusetts Senator joins three others bidding for the Republican party's nomination.
Brown is going up against former U.S. Senator Bob Smith, former Massachusetts Senator Jim Rubens, and Activist Karen Testerman.
Whoever wins the primary will then face off against Democratic Senator Jeanne Shaheen.
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