But the former Delaware senator emerged as a front-runner on Super Tuesday in March. Those primaries earned him a total of 458 delegates, causing Pete Buttigieg, Klobuchar and businessman Michael Bloomberg to drop out of the race. They would go on to endorse their colleague, as the Democratic party rallied behind Biden.
Not long after Sanders and Warren dropped out of the race, making Biden the presumptive Democratic presidential nominee.
In the months that would follow, Biden took caution amid the coronavirus pandemic and switched to hosting virtual events. And his limited efforts were only bolstered by the announcement of his pick for Vice President.
On Tuesday, Aug. 11, the former Vice President finally revealed that he asked the California senator to be his running mate. He said in a statement, written in part, “Her record of accomplishment—fighting tooth and nail for what’s right—is why I’m choosing her. There is no door Kamala won’t knock on, no stone she’ll leave unturned, if it means making life better—for the people.”