Conversation so far:
How was Bob Graham as a U.S.
Senator?
Graham was then elected to the U.S.
Senate.
Was there any controversy involving him as a U.S Senator?
CANNOTANSWER.
What happened during his time as a U.S.
Senator?
Graham served on the environment and finance committees, and was a founding member of the Democratic Leadership Council.
Was Graham very popular or well liked by many?
Graham had served 38 consecutive years in public office.

Question: Did he make any changes?
Self-contained rewrite: Did U.S. Senator Bob Graham make any changes?