Unfortunately that occurred in 1988, not this year when his wife has remained in the race long beyond the point where she had any real mathematical chance of winning. With the final primaries taking place in a few days there is certainly no longer any reason to expect Hillary Clinton to leave the race before that time, regardless of how questionable it has been for her to have remained until this date. There’s little doubt that the party leaders will do everything possible to get Clinton to cease the farce her campaign has become after the final states vote, even if it requires considerable pressure (most likely out of public view).
If arguments are needed as to why Clinton should not remain in the race, we can turn to the advice of Bill Clinton from May 6, 1988. At that time Michale Dukakis did not have a majority of votes but was considered the presumptive nominee. Ben Smith cites this report of AP quoting Bill Clinton:
“Gov. Dukakis has emerged as the voters’ choice, the clear leader in the Democratic nomination process,” said Arkansas Gov. Bill Clinton, described as the leader in the effort to round up the gubernatorial support that was announced during the day. “It is time for the party leadership to unite behind his candidacy,” he said.