A new [Celeste-Tell poll][cel] for El Diario on Tuesday showed Ciudadanos and the Spanish Socialist Party (PSOE) gaining ground, and the Popular Party (PP) and Podemos losing MPs in Spain's 350-seat lower house of parliament.

Yesterday, [a Sociométrica poll][socio] for El Español described the same broad strokes—losses for the PP and Podemos and gains for Ciudadanos and the PSOE—but suggested an enormous 54-seat leap for Albert Rivera's party, almost tripling their current total, contrasted with a projected 40-seat loss for Mariano Rajoy's governing PP.

The Celeste-Tel projection woul...