Doug Howgate, executive vice president of the Massachusetts Taxpayers Foundation, who previously advised Senate President Karen Spilka on health care policy, said he expects that outside groups this time will look seriously at Baker’s proposal. “Obviously, we want something that gives people access to lower-cost medications,” Howgate said. “At the same time, you don’t want to do things that will have unintended consequences in terms of drug costs, innovation, those sorts of things.”