He delayed meetings with Indiana Governor Roger Branigin to arrange a favorite son "stand in" for the campaign, and neglected to hire the campaign's 1964 campaign manager Larry O'Brien, despite Humphrey's insistence.
But Humphrey was able to convince Johnson to speak to the influential National Farmers Union in Minneapolis, ahead of the Wisconsin Primary.
Johnson replied that it was not in the best interest of the nation to mix the partisan politics of a presidential election with the ongoing Vietnam crisis, and that if elected, he probably would not be able to complete the term since the men in his family usually died in their early sixties.
After Johnson's withdrawal, Humphrey was hit with a barrage of media interest and fanfare.
In 1960, he mounted a full-scale run, winning primaries in South Dakota and Washington D.
President Johnson's popularity had plummeted as the election grew closer.Humphrey won the party's nomination at the Convention on the first ballot, amid riots in Chicago.He selected little-known Senator Edmund Muskie of Maine as his running mate.Humphrey entered the race too late to participate in any primaries, and relied on "favorite son" candidates to help him win delegates.He also lobbied for endorsements from powerful bosses within the Democratic Party, which provided him with necessary delegates.