Local activities of electoral candidates represent one of the key factors influencing voting behaviour. Many studies have shown an elevated electoral support for candidates in the municipality of their residence and the surrounding region.
By using the example of mayors who candidated in the 2017 Czech parliamentary elections, this article proves that this voting behaviour is manifested not only through the territorial concentration of preferential votes, but also through higher local electoral support of political parties represented by these candidates. This so-called friends and neighbours effect is stronger in smaller, less populous municipalities.
Its spatial extent is not necessarily limited to the respective municipality, but if a well-known and popular mayor appears at the top of the regional candidate list, it can affect voters living many kilometers away, especially in non-metropolitan areas.