Boston Globe – Anti-casino political campaigns across the state during the past year have eroded public support for casino gambling in Massachusetts, a potentially dangerous turn for the industry ahead of a possible campaign this fall to repeal the state casino law, political and casino specialists said Wednesday. Forty-six percent of likely voters approve of locating casinos in Massachusetts, while 43 percent disapprove, according to a new WBUR survey conducted by MassINC Polling Group. The poll, released Wednesday, shows a significant drop in support for the gambling industry in just the past two months. In a January survey, MassINC found…