We also need:
(1) A Supreme Court that obeys the Constitution.
(2) A president who enforces the Law.
First, state legislatures will once again appoint senators. Regardless of the state, it is doubtful their senators will consent to the appointment of judges hostile to the 10th amendment.
Second, the state will have the power to override scotus decisions by two thirds vote.
As for presidential powers, states will also be able to override federal regulations by two thirds vote and congress will have to approve regulations whose lifetime cost is more than $100 million.
These are significant checks on scotus and the executive.
Mark's proposed amendments would make the government even more federal than the design of 1787.
Unfortunately, offices must be filled by human beings with human frailties. But I think Levin does better than that.
If the states had a veto over legislation, executive orders, regulations and Supreme Court decisions, it would solve many, if not most, of the problems.