Governing Costs Hollow Center‑Left

When center‑left parties move from opposition to power they can rapidly lose electoral identity if they make visible trade‑offs (tax rises, unpopular appointments, perceived weak leadership) and if long‑running issues (immigration flows, local economic stagnation) keep signaling failure to core voters. Those combined signals accelerate voter defections to insurgent left and nationalist right forces, fragmenting traditional two‑party competition. — If true, this explains why several European center‑left parties risk fast decline after electoral victory and suggests parties must manage signaling (policy promises, appointments, messaging) differently while governing.