Before 2020 Super Tuesday, Amy Klobuchar, Pete Buttigieg, and Joe Biden were seen as ‘splitting the center democratic’ vote.
At the same time, Bernie Sanders had the largest consolidated block of left-of-center primary voters, and was leading shortly before the Super Tuesday elections.
This dynamic may have continued past Super Tuesday, but Sander’s fortune changed nearly overnight as Klobuchar and Buttigieg dropped out and endorsed Biden shortly before Super Tuesday.
With the two centrist competitors gone, Biden went on a clear path for Democratic nomination.
Question: What is known about any pressure Klobuchar and Buttigieg campaigns were under to drop out and endorse Biden, before the Super Tuesday elections?