Most Progressives were associated with the Democratic Party?

Answer 1

This is a hard one to answer since the term "progressive" can mean many things. In the modern era (20th century forward) the majority of liberal or radical politicians were Democrats. While it's not true that all Democrats are liberal or radical, it is a general trend of Democrats to look forward and toward change while it is a general trend of the Republicans to look backward and toward tradition. Since the notion of "progressive" is rooting the the concept of "progress" (improvement by moving forward and changing) it is logical to assume that most progressives are associated with the Democrats.