I don’t know. And she is still caucusing as a Democrat. For now.
The senator’s latest move continues her political evolution. She began her political career as a liberal activist and member of the Green Party. After joining the Democratic Party, she served in the Arizona state Legislature and went on to win a seat in the U.S. House in 2012 representing the Phoenix area. Once in Congress, Sinema went her own way and tacked toward the center, even voting for civil rights icon John Lewis for speaker rather than her party’s liberal leader, Nancy Pelosi. Sinema flipped a GOP-held Senate seat in 2018 and continued to carve out a role as a centrist dealmaker over the past four years, but frequently faced threats of a primary challenge from the left.