Conversation so far:
Where did Church study most of Frank Church's life?
sponsor of the national Wilderness Act.
When was he a sponsor of this Act?
In 1968.
Who else was involved in this Act?
Working with other members of Congress from northwestern states.
What was his political afiliation?
CANNOTANSWER.
What else did he do as a politician?
Church also sponsored, along with Pennsylvania Republican John Heinz, the "conscience clause.

Question: Who else was relevant in Churches political life?
Self-contained rewrite: Who else was relevant in Frank Churches political life besides John Heinz?