Bruins 4, Lightning 2: Nathan Horton registered two goals and rookie defenseman Dougie Hamilton added a pair of assists as visiting Boston held off Tampa Bay.Horton scored his second 2:33 into the third period, deflecting in defenseman Zdeno Chara's pass at the left circle for a 4-2 lead. Brad Marchand and Patrice Bergeron each had a goal and an assist while goalie Tuukka Rask made 24 saves for the Bruins.Steven Stamkos and Cory Conacher recorded goals for the Lightning, who dropped to 6-3-1 at home. Teddy Purcell had a pair of assists and Anders Lindback made 22 saves for Tampa Bay.Horton knocked home a rebound 1:11 into the contest and Bergeron made it 2-0 Bruins at 3:50 with the shot from right circle after a turnover. The Lightning settled down and cut the lead in half before the end of the first, when Stamkos snapped a shot past Rask from the slot after Purcell tapped it back to him at 8:13.Conacher tied the game 9:00 into the second session, beating Rask glove side after Purcell's pass sprung him in the left circle. The Bruins edged in front 3-2 after Marchand was first to a loose puck in the slot and beat Lindback at 13:58.GAME NOTEBOOK: The Bruins, who improved to 5-1-1 in February, killed off all three Tampa Bay power plays and have allowed just one goal down a man in eight road games this season. … Horton has 26 goals and 46 points in 45 games against Tampa Bay in his career. … The Lightning have sold out all 10 home games.