2016 presidential elections

She was a candidate in the 2016 Portuguese presidential election, but received only 4.26% of the votes, losing to Marcelo Rebelo de Sousa, and not being supported as the official candidate of her party.

Roseira announced her candidacy for the 2016 presidential elections on 17 August 2015 and formalized it on 22 December, at the Constitutional Court, with around 9 200 signatures. Her national agent was Eduardo Marçal Grilo and Simonetta Luz Afonso and Júlio Machado Vaz were the agents in Lisbon and Porto, respectively. Belonging to the honor committee of the candidacy Manuel Alegre, Jorge Coelho, José Vera Jardim, and Alberto Martins. Bruno Matias was the representative for youth.^[5][6][7]

She came in 4th place in the elections, with only 4.24% of the votes, a result well below what the initial polls predicted, in which she even disputed the second place with the other candidate supported by members of the Socialist Party, António Sampaio da Nóvoa. The result of less than 5% meant that she was not entitled to a state subsidy to cover the expenses of the electoral campaign.^{[8][9][10][11]}