Conversation so far:
Who was Gavel's running mate?
CANNOTANSWER.
Who did he compete against in 1972?
former Governor of Massachusetts Endicott Peabody had been running a quixotic campaign for the same post.
What significant events happened during the campaign?
At the convention's final day on July 14, 1972, presidential nominee McGovern selected and announced Senator Thomas Eagleton of Missouri as his vice-presidential choice.
What did Gravel do afterward?
Gravel was nominated by Bettye Fahrenkamp, the Democratic National Committeewoman from Alaska.

Question: What was he nominated for?
Self-contained rewrite: What was Mike Gravel nominated by Bettye Fahrenkamp for?