In Tuesday’s primary election for U.S. Senate in Michigan, a progressive socialist-backed candidate is facing a much more moderate Democrat. The outcome could provide insights into the future of the Democratic Party.

Abdul El-Sayed, a candidate endorsed by the far-left wing of the party, is facing off against U.S. Rep. Haley Stevens, a centrist, pro-Israel candidate currently serving in the state’s 11th Congressional District.

Recent polling has indicated that El-Sayed, who was once neck and neck with Stevens, is now surging in popularity after last week’s debate.