Final answer:
The Progressive party led by Senator Robert LaFollette advocated for various reforms, except for increased power and authority for the U.S. Supreme Court.
Step-by-step explanation:
The Progressive party led by Senator Robert LaFollette advocated for various reforms in the early 1900s. However, one of the reforms that they did not advocate for was increased power and authority for the U.S. Supreme Court. The Progressive party focused on government ownership of railroads, economic relief for farmers, opposition to antilabor injunctions, and opposition to monopolies.
However, he did not advocate for increased power and authority for the U.S. Supreme Court; therefore, the correct answer to the question is (E).