said by TKJunkMail :

... national regulation as an alternative every single time. Especially when state rules vary greatly from state to state. It is the same reason that the auto industry tries over and over to kill the California EPA regs that conflict with national EPA regs. It costs a lot to tailor your business from state to state and adds a lot of lawyers and lobbyists to your payroll to deal with many government agencies. Much preferable to deal with only 1.