Table 2. Description of considered political parties for each election.
The official sources of election results are provided on [35](Euro14), [36](Italy13), and [37] (Bulgaria13) respectively.
| Euro14: European Parliament election 2014, Italy | |||
| Rank | Party | Actual votes | Leaders |
| 1 | Partito Democratico (PD) | 11,203,231 | Matteo Renzi |
| 2 | MoVimento Cinque Stelle (M5S) | 5,807,362 | Beppe Grillo |
| 3 | Forza Italia (FI) | 4,614,364 | Silvio Berlusconi |
| 4 | Lega Nord (LN) | 1,688,197 | Matteo Salvini |
| 5 | Nuovo Centrodestra—Unione di Centro (NCD-UdC) | 1,202,350 | Angelino Alfano, Pier Ferdinando Casini |
| 6 | L’Altra Europa con Tsipras (AET) | 1,108,457 | Alexis Tsipras, Nichi Vendola, Paolo Ferrero |
| 7 | Fratelli d’Italia—Alleanza Nazionale (FdI-AN) | 1,006,513 | Giorgia Meloni |
| Italy13: Italian general election 2013 | |||
| Rank | Party | Actual votes | Leaders |
| 1 | MoVimento Cinque Stelle (M5S) | 8,691,406 | Beppe Grillo |
| 2 | Partito Democratico (PD) | 8,646,034 | Pier Luigi Bersani, Matteo Renzi |
| 3 | Il Popolo della Libertà (PdL) | 7,332,134 | Silvio Berlusconi |
| 4 | Scelta Civica (SC) | 2,823,842 | Mario Monti |
| 5 | Lega Nord (LN) | 1,390,534 | Roberto Maroni |
| 6 | Sinistra Ecologia Libertà (SEL) | 1,089,231 | Nichi Vendola |
| Bulgaria13: Bulgarian general election 2013 | |||
| Rank | Party | Actual votes | Leaders |
| 1 | GERB | 1,081,605 | Boyko Borisov |
| 2 | BSP | 942,541 | Sergei Stanishev |
| 3 | DPS | 400,446 | Lyutvi Mestan |
| 4 | ATAKA | 258,481 | Volen Siderov |