“George McGovern went way out on the left in 1972 and wrecked the democrat party until Jimmy Carter came along and saved it in 1976.sarc”
By today’s standards McGovern was a moderate.
Yup. Dems already tried it. Early in Obama administration Pelosi's House passed entire Democratic platform including the kitchen sink, and sent it to the Senate. Only Republican filibusters and Scott Brown's election stopped some of it.