Conversation so far:
Who was Mike Gravel's running mate in the 1972 election?
Who did Mike Gravel compete against in 1972?
Mike Gravel was not alone in this effort, as former Governor of Massachusetts Endicott Peabody had been running a quixotic campaign for the same post since the prior year.

Question: What significant events happened during the campaign?
Self-contained rewrite: What significant events happened during the 1972 campaign?