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)

Associated Press
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)
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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