Former Massachusetts U.S. Senator Scott Brown, left, walks into a crowd of supporters after announcing his plans to run for U.S. Senator in New Hampshire Thursday, April 10, 2014 in Portsmouth, N.H. Brown hopes to unseat U.S. Sen. Jeanne Shaheen, D-N.H. (AP Photo/Jim Cole)
Former Massachusetts U.S. Senator Scott Brown announces his plans to run for the U.S. Senate in New Hampshire Thursday, April 10, 2014 in Portsmouth, N.H. Brown hopes to unseat U.S. Sen. Jeanne Shaheen, D-N.H. (AP Photo/Jim Cole)
Former Massachusetts Senator Scott Brown is greeted by supporters after announcing plans to form an exploratory committee to enter New Hampshire's U.S. Senate race against Democratic Sen. Jeanne Shaheen,, Friday, March 14, 2014 in Nashua, N.H. (AP Photo/Jim Cole)
Former Massachusetts Senator Scott Brown acknowledges his wife Gail as he announces his plans to form an exploratory committee to enter New Hampshire's U.S. Senate race against Democratic Sen. Jeanne Shaheen,, Friday, March 14, 2014 in Nashua, N.H. (AP Photo/Jim Cole)
President Barack Obama is joined by former President Bill Clinton, Sen. Jeanne Shaheen, D-N.H., and Gov. John Lynch, D-N.H. at a campaign event, Sunday, Nov. 4, 2012, in Concord, N.H. (AP Photo/Jim Cole)