Clean energy supporters in Massachusetts announced legislation Monday, backed by more than a quarter of the state legislature, committing Massachusetts to get 100 percent of its energy needs from clean and renewable sources by mid-century. The legislation, introduced in the House of Representatives by Rep. Sean Garballey and Marjorie Decker and in the Senate by Sen. Jamie Eldridge, establishes targets for Massachusetts to meet its electricity needs from renewable energy by 2035 and all of