Midterm elections have become a surprisingly reliable bellwether in the modern political era.Over the last two decades, they’ve typically favored the party out of power—offering an early read on political momentum heading into the next presidential contest. .memberful-global-teaser-content p:last-child{ -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent); mask-image: linear-gradient(180deg, #000 0%, transparent); } Join now to continue reading.Members get exclusive analysis, bonus features and no advertising. Learn more.If you’re already a member, sign in to your account.