Three polls in Spain say the far left Unidos Podemos alliance could boost its share of the vote in a new election to overtake the Socialists as the main opposition party.

Surveys by three private pollsters published Sunday in newspapers El Pais, El Mundo and El Espanol show the conservative Popular Party could win the election — albeit not with a sufficient majority to form a government.

But the polls all coincide in suggesting newcomer Unidos Podemos could become Spain's second political force, ousting the Socialists who have traditionally rotated in power within a two-party system with the Popular Party.

Months of negotiations have followed inconclusive elections on Dec. 20, but they failed to secure a breakthrough. A new election will be held on June 26.