The race for Michigan's open Senate seat between Democratic U.S. Rep. Elissa Slotkin and Republican former congressman Mike Rogers remained too early to call Wednesday after results in other states showed Democrats lost their slim majority in the upper chamber.

U.S. Representative Elissa Slotkin, a third-term lawmaker with extensive national security experience, won election to the U.S. Senate in Michigan, Edison Research projected on Wednesday, a boost for Democrats trying to hold their majority in the chamber.