Kyrsten Lea Sinema is an American politician serving as the senior United States senator from Arizona since 2019. A member of the Democratic Party, she served three terms as a state representative for the 15th legislative district from 2005 to 2011, one term as the state senator for the 15th legislative district from 2011 to 2012, and three terms as the United States representative for the 9th district from 2013 to 2019