Save it from what?

If your answer is from a failing economy, or from wasting lives and loot on war, then you need to weed out those from the side of politics that has given us so much of those things over the last decade. Then you need to consider the survivors and ask: Have they learned the lessons?

If those lessons had been learned then those responsible for faking WMD intelligence in order to take us into an unnecessary war that killed so many Americans and Arabs, would be living in Leavenworth.

Those who, through their greed and professional incompetence caused the GFC, costing millions of us our homes or retirement provisions, would also now be in jail.

Neither of those things have happened and new effective laws have not been enacted to prevent them from happening again. So clearly neither the current administration, its supporters, or Congress, have not learned the lessons either.

Conclusion: The USA desperately needs a left wing government, not because that would be a good thing on a permanent basis, but in order to restore the balance after decades of increasingly mad conservative rule. Even a left wing opposition would be helpful.
Instead, we are heading in the opposite direction towards a correction of another kind. Along that road will be the external stimulus of economic ruin and military defeat.
The Romans chose this road, so we know where it goes.