Mariano Rajoy, Spain's acting Prime Minister of the caretaker government, casts his vote for the Spanish general election on June 26, 2016 in Madrid, Spain. Spanish voters head back to the polls on June 26 after the last election in December failed to produce a government. Latest opinion polls suggest the Unidos Podemos left-wing alliance could make enough gains to come in second behind the caretaker government of the center-right Popular Party.