Jacklyn Sheryl Rosen (née Spektor; born August 2, 1957) is an American politician serving as the junior United States senator from Nevada since 2019. A member of the Democratic Party, she was the U.S. representative for Nevada's 3rd congressional district from 2017 to 2019. Rosen was elected to the Senate in 2018, defeating Republican incumbent Dean Heller.[1] She was the only House freshman to win a Senate seat in the 2018 midterm elections and the only challenger to defeat a Republican incumbent senator in 2018.