Spain's four major political parties have kicked off a two-week campaign ahead of a June 26 vote aimed at breaking an electoral deadlock that has left the country with a caretaker government.

Campaigning began at midnight Thursday with rallies by acting Prime Minister Mariano Rajoy of the conservative Popular Party, Pedro Sanchez of the Socialists, Pablo Iglesias of the far-left Unidos Podemos alliance and Albert Rivera of the business-friendly Ciudadanos.

Polls suggest the Popular Party will win the most votes as it did in the last election on Dec. 20 but again fall far short of its 2011-2015 parliamentary majority.

The surveys indicate Unidos Podemos could take 2nd place and overtake the Socialists and that Ciudadanos will come in fourth.

Analysts predict the next vote could yield another political stalemate.