Two days after California Gov. Gavin Newsom announced that Laphonza Butler would fill the U.S. Senate seat of the late Dianne Feinstein, the new senator was sworn in on Capitol Hill by U.S. Vice President Kamala Harris. | Replacing the Late Sen. Dianne Feinstein, Butler Becomes the 3rd Black Woman to Serve in Upper Chamber By Lauren Victoria Burke, NNPA Newswire contributor Two days after California Gov. Gavin Newsom announced that Laphonza Butler would fill the U.S. Senate seat of the late Dianne Feinstein, the new senator was sworn in on Capitol Hill