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US Senator from Arizona (D) Kirsten Sinema holds a lawbook as she is sworn in by Vice President Mike Pence during the swearing-in re-enactments for recently elected senators in the Old Senate Chamber on Capitol Hill in Washington, DC January 3, 2019. (Photo by Alex EDELMAN / AFP) (Photo credit should read ALEX EDELMAN/AFP/Getty Images)

US Senator from Arizona (D) Kirsten Sinema holds a lawbook as she is sworn in by Vice President Mike Pence during the swearing-in re-enactments for recently elected senators in the Old Senate Chamber on Capitol Hill in Washington, DC January 3, 2019. (Photo by Alex EDELMAN / AFP)        (Photo credit should read ALEX EDELMAN/AFP/Getty Images)