FILE – In this March 2, 2020 file photo, Sen. Amy Klobuchar, D-Minn., endorses Democratic presidential candidate former Vice President Joe Biden at a campaign rally Monday, March 2, 2020 in Dallas. As presumptive Democratic presidential nominee Joe Biden begins the process of choosing a running mate amid the coronavirus crisis, managing the pandemic has become its own version of an audition. For potential picks, lobbying for the job means breaking into the national conversation, positioning themselves as leaders and executing at their day job. (AP Photo/Richard W. Rodriguez)