Eight years ago Vox was a tiny party on the fringes of Spanish politics. Polls now put it close to power as Spain heads to snap elections on November 29, called amid a housing crisis.
According to a survey by the newspaper El Pais, the conservative People's Party (PP) and Vox would secure 198 seats in parliament, above the 176 needed for a majority. Vox's support is predicted to double from the last elections in 2023. Sanchez's Socialist Party is forecast to win 112 seats, down from 121.
In 2023 the PP won the most votes but not enough to lead on its own, and it declined to enter a coalition with Vox. Sanchez instead formed a government with the help of the Catalan nationalist party, Together for Catalonia. Since then the PP has formed four regional governments with Vox, and the parties share power in about 100 councils. A national coalition would return the hard right to power for the first time since the death of Francisco Franco in 1975.
"There is hope for Spain with these elections. We will fight for victory and to convince Spaniards we are worth voting for," said Jose Antonio Fuster, national spokesman for Vox. "But the PP cannot make the same mistakes as 2023 and must not start dividing up ministries until we have won."
The party is drawing support from younger voters. Alberto Munoz, a 24-year-old computer programmer from Barcelona, said: "What I really hate about Sanchez is how keen he is to allow more migrants into our country."
Steven Forti, an expert on the far right at the Autonomous University of Barcelona, said Vox distances itself from the Franco dictatorship, like other far-right parties in Europe and Latin America. Vox leader Santiago Abascal once told parliament that Sanchez's government was the "worst for the past 80 years", a remark Forti called "dog whistle politics".
"Young people are attracted to Vox by a feeling of rebellion against the established parties, nationhood and antimigrant feeling," Forti said.
If the Socialists lose, it would spell the end of one of the last left-wing governments in Europe, after advances for the far right in France, Germany, Italy, Austria and Finland.