Not a Presidential election year and the Senate was controlled by President’s party.
This time there is a perfect storm. Ideological balance on a severely divided court and the Senate controlled by the opposition in a Presidential election year. Nearly 20% of all nominees to the Supreme Court have failed to be confirmed — stuck in committee, withdrawn, or outright rejected. With this perfect storm, historically the odds are well over 60% of any nominee being rejected. And with the current partisan divide it is almost guaranteed.