This research note investigates the role of paid digital campaigning in the 2018 local elections in Flanders. We make use of the official declarations which candidates are legally required to submit. In these declarations, candidates indicate whether and how much they invested in online campaigning tools during the four months preceding the elections. We collected data on a sample of 3,588 individual candidates running in the 30 municipalities of the Leuven Arrondissement. A multilevel logistic regression model shows that the odds of spending on digital campaigning increases among incumbent aldermen and local councillors. The latter finding supports the normalization thesis of digital campaigning. The results also show that scale is important – the more potential voters a candidate has, the higher the odds that the candidate invests in digital tools.

Sub-constituency campaigning occurs when parties focus their campaign resources on specific geographical areas within an electoral district. This behaviour was traditionally thought to occur only in single-member plurality elections, but recent research demonstrates that proportional systems with multi-member districts can also elicit sub-constituency campaigning. However, most studies of sub-constituency campaigning rely on self-reported measures of campaigning, not direct measures of campaign intensity in different regions and communities. We present novel data on geographical variations in the intensity of Flemish parties’ campaign advertising during the 2014 general elections in Belgium, which provides a direct measure of sub-constituency campaigning. Our findings show clear evidence of sub-constituency campaigning: parties campaign more intensely in municipalities where they have stronger electoral support and in municipalities with greater population density.