Robert Dahl article review

In Robert Dahl's article, "James Madison Republican or Democrat," Dahl gives interpretations and insight on 4 questions that Madison "regularly sought" to answer: 

1) What is the new system of government to be called?; 

2) Does a common good exist and, if so, can we know what it is?; 

3) What are the major threats to achieving the common good?; and 

4) Can these threats be overcome and, if so, how?

Do you agree or disagree with Dahl's interpretations of Madison's positions on each of these questions?