The Department of Revenue won’t certify the official amount raised until later this year. But the estimates immediately buoyed supporters’ claims that the surtax would deliver much-needed revenue for the state despite fears it could drive out some of the state’s wealthiest residents.“Opponents of the Fair Share Amendment claimed that multi-millionaires would flee Massachusetts rather than pay the new tax, and they are being proven wrong every day,” said Andrew Farnitano, a spokesperson for Raise...