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Read previewCan the Democrats replace President Joe Biden at the top of the ticket?
In 1968, when President Lyndon B. Johnson dropped out of the race, his vice president, Hubert Humphrey, entered the Democratic primary, but he was too late to get on some states' ballots.
Delegates eventually voted to name Humphrey the nominee, but he ultimately lost the election to former Vice President Richard Nixon.
AdvertisementTypically, the vice president is the go-to individual, but Gift said Vice President Kamala Harris's approval ratings are too low for her to be a serious contender.
Persons:
—, Joe Biden, Lyndon B, Johnson, Hubert Humphrey, Humphrey, Robert F, Kennedy, Eugene McCarthy, Martin Luther King Jr, John F, Richard Nixon, Biden, Mitch Robertson, Robertson, Thomas Gift, Kamala Harris's, Mark Shanahan, Gavin Newsom, Gretchen Whitmer, Transportation Pete Buttigieg, Shanahan, Harris, Kamala Harris, Iwan Morgan, Morgan, John Owens, it's, Owens
Organizations:
Service, Democratic, Business, Convention, Delegates, University College London, Democrats, UCL's Center, University of Surrey, Transportation, Trump, UCL's Institute of, Labor, American University's Center, Congressional, Presidential Studies
Locations:
Chicago, Vietnam, Los Angeles, Americas