FILE PHOTO: Democratic 2020 U.S. presidential candidate Warren campaigns in

    FILE PHOTO: A bottle of Purell hand sanitizer sits next to campaign canvass packets at a field office for Democratic 2020 U.S. presidential candidate and U.S. Senator Elizabeth Warren (D-MA) in Graniteville, South Carolina, U.S., February 28, 2020. REUTERS/Brian Snyder/File Photo