Today voters will decide which parties have a chance to decide Spain’s future government. The latest opinion polls show the right-wing Partido Popular winning the elections but in need of a helping hand from the Socialists to secure enough backing. The leftist movement Podemos emerges second in the people’s choice, with the potential to seize power if it forges a coalition with the Socialists. So once again, social democrats hold the key to government. An uneasy prospect as supporting others might wreck their future standing.