[3][4] The party was based and had its best electoral results in Sardinia, but had a structure countrywide, consisting primarily of former members of the UDEUR, notably including Gianfranco Saraca, Luca Bagliani, Danilo Bertoli, Sergio Deorsola, and Antonio Potenza (leader of Basilicata's United Populars).
[5][6] In the 2010 Sardinian provincial elections the party did especially well in northern Sardinia: 10.7% in Sassari[7] and 6.2% in Olbia-Tempio.
[citation needed] In June 2012, through Mulas, the UPC joined the newly formed parliamentary group Sardinia Tomorrow, along with other centrist councillors.
[15][16] In the run-up of the 2018 general election the UPC joined the Popular Civic List (CP), a centrist electoral list within the centre-left coalition, comprising mainly Popular Alternative (AP), Italy of Values (IdV), the Centrists for Europe (CpE), Solidary Democracy (DemoS), the Union for Trentino (UpT) and Italy Is Popular (IP).
In the 2024 regional election the party was a junior partner of a joint list formed primarily by Action and More Europe.