Rep. Alexandria Ocasio-Cortez (D-NY) endorsed leftist Democrat Abdul el Sayed in his campaign to be Michigan’s next U.S. senator on Thursday.

Ocasio-Cortez’s backing of el Sayed comes after a swing of several midterm election primaries showed momentum growing against the Democratic establishment, with voters in states such as New York and Colorado picking either socialist or anti-establishment challengers over mainstream Democrats. The move also bucks the primary goals of Senate Minority Leader Chuck Schumer (D-NY), whose preferred candidate in the Michigan Senate race is the more centrist Rep. Haley Stevens (D-MI).