Controlling for district magnitude, party characteristics and election effects, we find that the major Spanish parties-PP and PSOE-mobilise districts where they are more likely to win a new seat or are in danger of losing one they already hold. As a determinant of campaign intensity, the predicted closeness of the district race is more relevant in the smallest districts. We also find that Spanish parties mobilise their strongholds, an effect as important as the closeness of the district race. We suggest that in the mobilisation choices made by Spanish party elites political finance motivations might play a role.