Earth Party

In April 2009, the party announced in a joint press conference with the leader of the pan-European alliance Libertas.eu Declan Ganley that it would run for the 2009 European Parliament election with an open electoral list under the banner of Libertas.[7] While not against European integration, MPT demands more accountability and transparency from the European Union, and the pursuit of a referendum on the Lisbon Treaty in Portugal.[8] In the elections, MPT received 24,062 votes (0.67% of the votes).

For the 2009 Portuguese legislative election, MPT formed a coalition with the Humanist Party on mainland Portugal that received 0.22% of the votes. Including MPT's votes in Azores and Madeira, where they ran a list on their own, they reached 0.28% nationwide. However, the 2009 local elections were a success in terms of the number of people elected, as MPT elected two councilors, 17 municipal assembly members and 47 parish councilor posts.

In the 2011 Portuguese legislative election, MPT stood under its own open lists throughout Portugal and achieved 0.41% of the national vote, catapulting it from 14th to 8th place overall in comparison to the 2009 Portuguese legislative election. This was largely due to its more professional campaigning – it employed a campaign manager for the first time – and the inclusion in its lists of a number of popular celebrities.

In the 2011 Madeira regional election the Party elected one Legislative Assembly member despite a fall in its number of votes of 0.3%.

MPT achieved its first major electoral success independent of any coalition, in the 2014 European Parliament election, winning 7.14% of the vote and electing two MEPs: the former Chairman of the Portuguese Bar Association António Marinho e Pinto (who subsequently left the party due to personal differences with his fellow MEP) and the lawyer José Inácio Faria.

On 21 November 2014, the MPT was admitted as a full member of the Alliance of Liberals and Democrats for Europe (ALDE) at the ALDE congress in Lisbon.[9]

MPT held its IX Party Congress on 22 November 2014 in Lisbon, where incumbent president John Rosas Baker announced his intention not to stand for reelection and was replaced by MEP José Inácio Faria.

The party contested the 2015 legislative election under its own open lists but, in what was widely considered a fiasco, failed to improve on its 2009 Portuguese legislative election result, gaining less than 0.5% of the popular vote and failing to elect any MPs to the Assembly of the Republic.

On 21 and 22 October 2018, the MPT had its bank accounts blocked due to a court decision and financial liabilities. As a consequence, the party fell into insolvency. The then-party leader Luís Vicente informed the public about this situation on 21 December 2018.[10]

The 2019 legislative elections, which were contested under MPT's own open lists, had a disastrous outcome, with the party losing practically half of its previous votes.

MPT contested the 2022 legislative elections under its own open lists, ending up losing more than half of the votes previously held for the second consecutive time.