Traci Bridge Longa feels she’s got a unique vantage point on the casino debate raging in Foxborough: to build or not to build a casino on 200 acres across from Gillette Stadium owned by New England Patriots owner Robert Kraft. Longa, 43, grew up in Las Vegas where her single mother supported two daughters on her salary as a blackjack dealer. For the past 9 years, Longa has lived in Foxborough, where she is raising her own two children. Recently, she decided to jump into the middle of the casino fray, which has split the town into two factions: a vocal, well-organized anti-casino group against a quieter pro-casino group. She just wants to keep the debate civil.