California Sen. Kamala Harris has made an unusual fundraising move that is sure to fuel speculation about her prospects to be Joe Biden’s running mate on the Democratic presidential ticket. Harris, who dropped out of the White House race in December, has set up the kind of arrangement with the Democratic National Committee that is typically reserved for nominees trying to attract large donations from the party’s biggest boosters. Harris, 55, will host her first virtual fundraiser Thursday under the new agreement. It allows contributors to give the maximum of $357,800, with $2,800 going to retire Harris’ presidential campaign debts...