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In this Jan. 16, 2020 file photo, Sen. Kamala Harris, D-Calif., talks to reporters about the impeachment trial of President Donald Trump on charges of abuse of power and obstruction of Congress, at the Capitol in Washington. 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/Matt Rourke)