A book review by Breitbart's Joel Pollak summarizes:
This is a genius idea. Polls, problematic though they may be, consistently show that many laws and proposals by our government - including Obamacare - are unpopular. Wildly unpopular. Yet Congress and this administration are not interested in the will of the people, so we must make them interested by circumventing them - all within our legal rights as set out within the Constitution. My husband likes to say that the Constitution is one of the most important documents that no one reads. It's not hard to read or find, though. Go here.
Breitbart News also gave Mark Levin an interview, presumably to give his book publicity and allow him to discuss what is in it and why he wrote it. I recommend reading any of these links. His 11 proposed amendments are interesting and best of all, make sense. His overarching idea is that we must use the Constitution to save the Constitution.