General Manager Dale Tallon has begun his rebuilding of the Florida Panthers.
TSN Insider Darren Dreger reports that after Tallon was hired by the Panthers, Horton told him that he wanted out.
The 25-year old Horton has scored 20 or more goals in each of the last five seasons.
After being drafted third overall in the 2003 NHL Entry Draft, the Welland, Ontatio native amassed 142 goals, 153 assists, and 295 points in his six-year career with the Panthers.
The 26-year old Campbell, recorded 2 goals and 15 assists in 60 games last season. In 363 career games, the forward has totaled 29 goals and 56 assists.
Wideman, who tallied 6 goals and 24 assists in 76 games with the Bruins in 2009-10, should help bring some offence to the Panthers' defensive corps. In the 2007-08 and 2008-09 seasons, he recorded 13 goals each year.
The Panthers now have five of the first 50 picks in this year's draft. Along with the newly acquired 15th pick, they have the third overall pick, along with three picks in the second round (33rd, 36th and 50th).
The Bruins have the second overall choice in the Draft due to last season's Phil Kessel trade with the Toronto Maple Leafs.