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FILE - In this Dec. 9, 2009 file photo, then-Republican senatorial candidate Scott Brown responds to a reporter's question during a morning news conference at his campaign headquarters in Needham, Mass. Brown said Tuesday, Jan. 29, 2013 that the former U.S. senator from Massachusetts is "leaning strongly toward seeking a return to Washington and will likely enter the race to replace Sen. John Kerry early next week. (AP Photo/Gretchen Ertl, File)
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FILE - In this Oct. 5, 2012 file photo, then-Sen. Scott Brown, R-Mass., right, laughs as former Massachusetts Gov. William Weld talks with reporters after Weld endorsed Brown in Boston. Weld said Monday, Feb. 4, 2013, he will not seek the Senate seat vacated when John Kerry was named secretary of state. Brown said Friday, Feb. 1, 2013, the he would not seek that seat either. (AP Photo/Winslow Townson, File)
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Then U.S. Sen. Scott Brown, R-Mass., left, hugs his wife Gail Huff, center, at the conclusion of his concession speech at an election night watch party in a hotel in Boston, Tuesday, Nov. 6, 2012. Brown lost to Democratic challenger Elizabeth Warren in his bid for re-election to the U.S. Senate. (AP Photo/Steven Senne)
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FILE - In this Nov. 13, 2012 file photo, then Sen. Scott Brown, R-Mass., speaks during a media availability, on Capitol Hill in Washington. Brown, who was defeated in his re-election bid, said Friday, Feb. 1, 2013 that he will not run for the Senate seat vacated by John Kerry, who was named secretary of state. (AP Photo/Alex Brandon, File)
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FILE - In this Nov. 4, 2012, file photo, then-Sen. Scott Brown, R-Mass., waves to supporters from his bus after a campaign rally at Faneuil Hall in Boston. Three years ago, Brown was a little-known Republican state senator from Massachusetts who shocked Democrats by winning a U.S. Senate seat. Now, having compiled a voting record more moderate than his tea party allies would have liked and losing his bid for a full term, Brown is considering whether to seize a second chance to return to the Senate in another special election. (AP Photo/Michael Dwyer, File)
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FILE - In this Oct. 24, 2012, file photo, then-Sen. Scott Brown, R-Mass., uses a bull horn at a campaign stop in Watertown, Mass. Three years ago, Brown was a little-known Republican state senator from Massachusetts who shocked Democrats by winning a U.S. Senate seat. Now, having compiled a voting record more moderate than his tea party allies would have liked and losing his bid for a full term, Brown is considering whether to seize a second chance to return to the Senate in another special election. (AP Photo/Charles Krupa, File)
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FILE - In this Jan. 19, 2012, file photo, then-Sen. Scott Brown, R-Mass., pumps his fist during his re-election campaign kick-off in Worcester, Mass., in this Jan. 19, 2012 file photo. Three years ago, Brown was a little-known Republican state senator from Massachusetts who shocked Democrats by winning a U.S. Senate seat. Now, having compiled a voting record more moderate than his tea party allies would have liked and losing his bid for a full term, Brown is considering whether to seize a second chance to return to the Senate in another special election. (AP Photo/Charles Krupa, File)
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Then U.S. Sen. Scott Brown, R-Mass., left, embraces former football quarterback Doug Flutie, right, after delivering a concession speech at an election night watch party in a hotel in Boston, Tuesday, Nov. 6, 2012. Brown lost to Democratic challenger Elizabeth Warren in his bid for re-election to the U.S. Senate. (AP Photo/Steven Senne)
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Then U.S. Sen. Scott Brown, R-Mass., picks up his ballot with his daughter Arianna, left, to cast his vote in Wrentham, Mass., on Election Day, Tuesday, Nov. 6, 2012. Brown is facing Democratic candidate Elizabeth Warren for the U.S. Senate. (AP Photo/Gretchen Ertl)
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Then U.S. Sen. Scott Brown, R-Mass., gets into his truck after voting in Wrentham, Mass., on Election Day, Tuesday, Nov. 6, 2012. Brown is facing Democratic candidate Elizabeth Warren for the U.S. Senate. (AP Photo/Gretchen Ertl)
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Then U.S. Sen. Scott Brown, R-Mass., waits in line with his daughter Arianna to cast his vote in Wrentham, Mass., Election Day, Tuesday, Nov. 6, 2012. Brown is facing Democratic candidate Elizabeth Warren for the U.S. Senate. (AP Photo/Gretchen Ertl)
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Former U.S. Sen. Scott Brown, R-Mass., left, speaks with a reporter before boarding his bus following a stop at a Brown campaign office, in Walpole, Mass., Monday, Nov. 5, 2012. (AP Photo/Steven Senne)
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Then U.S. Sen. Scott Brown, R-Mass., left, and his wife Gail Huff, center right, speak with supporters during a campaign stop at a Brown campaign office, in Walpole, Mass., Monday, Nov. 5, 2012. (AP Photo/Steven Senne)
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Former U.S. Sen. Scott Brown, R-Mass., left, signs a poster during a campaign stop at a Brown campaign office, in Walpole, Mass., Monday, Nov. 5, 2012. (AP Photo/Steven Senne)
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Former Sen. Scott Brown, R-Mass., center, greets supporters as his family, from right, daughter Ayla, wife Gail Huff and daughter Arianna wait on stage during a campaign rally at Faneuil Hall in Boston, Sunday, Nov. 4, 2012. (AP Photo/Michael Dwyer)
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Former Sen. Scott Brown, R-Mass., center, greets supporters as he arrives for a campaign rally at Faneuil Hall in Boston, Sunday, Nov. 4, 2012. (AP Photo/Michael Dwyer)
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Then Sen. Scott Brown, R-Mass., speaks during a campaign rally at Faneuil Hall in Boston, Sunday, Nov. 4, 2012. (AP Photo/Michael Dwyer)
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Ex-Sen. Scott Brown, R-Mass., foreground left, speaks during a campaign rally at Faneuil Hall in Boston, Sunday, Nov. 4, 2012. (AP Photo/Michael Dwyer)
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Then Sen. Scott Brown, R-Mass., speaks to supporters during a reelection campaign stop at the "Plimoth Plantation" in Plymouth, Mass., Saturday, Nov. 3, 2012. (AP Photo/Stephan Savoia)
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Gail Huff, wife of then Sen. Scott Brown, R-Mass., reacts with their daughters Ayla, left, and Arianna, right, as he delivers an address to supporters outside "Grumpy's Restaurant" in East Dennis, Mass., Nov. 3, 2012. (AP Photo/Stephan Savoia)
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Then Sen. Scott Brown, R-Mass., peers out of his campaign bus as he arrives at "Grumpy's Restaurant" in East Dennis, Mass., to campaign for reelection Saturday, Nov. 3, 2012. (AP Photo/Stephan Savoia)
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Former New York City Mayor Rudy Giuliani, left, is introduced by then Sen. Scott Brown, R-Mass., to his supporters as he campaigns for reelection in the North End neighborhood of Boston Friday, Nov. 2, 2012. Brown's wife Gail Huff is at right. (AP Photo/Stephan Savoia)
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Then Sen. Scott Brown, R-Mass., makes his way through a crowd a greets supporters as he campaigns for reelection in the North End neighborhood of Boston, Friday, Nov. 2, 2012. (AP Photo/Stephan Savoia)
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Former New York City Mayor Rudy Giuliani, accompanies Sen. Scott Brown, R-Mass. on a walk along Hanover Street in the North End neighborhood of Boston, Friday, Nov. 2, 2012, as Brown campaigns for reelection. (AP Photo/Stephan Savoia)
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Former U.S. Sen. Scott Brown, R-Mass., shakes hands with supporters as he arrives, with his wife Gail Huff, right, for a campaign rally in Wakefield, Mass., Thursday, Nov. 1, 2012. (AP Photo/Charles Krupa)
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Then U.S. Sen. Scott Brown, R-Mass., left, speaks with U.S. Senator Susan Collins, R-Maine, right, while riding on a Brown campaign bus in Milford, Mass., Thursday, Nov. 1, 2012. (AP Photo/Steven Senne)
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Then U.S. Sen. Scott Brown, R-Mass., right, addresses an audience during a campaign event at a restaurant, in Milford, Mass., Thursday, Nov. 1, 2012. (AP Photo/Steven Senne)
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Then Sen. Scott Brown, R-Mass., talks to a member of the Massachusetts State Legislature, not seen, while touring a seawall on Cape Cod Bay in Plymouth, Mass., while campaigning Wednesday, Oct. 31, 2012. (AP Photo/Stephan Savoia)
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Former Sen. Scott Brown, R-Mass., talks to members of the media as he stands along a seawall he was touring on Cape Cod Bay while campaigning in Plymouth, Mass., Wednesday, Oct. 31, 2012. (AP Photo/Stephan Savoia)
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Attorney and victims' rights advocate Wendy Murphy, right, shakes hands with then Sen. Scott Brown, R-Mass., during a news conference at Brown campaign headquarters in Boston, Friday, Oct. 26, 2012. Murphy announced her endorsement of Brown in his run for re-election to the U.S. Senate. (AP Photo/Michael Dwyer)