The valence of visual stimuli influences behavior due to facilitations and inhibitions that occur at several levels of the sensory-motor system. Approach and avoidance reactions were proposed to explain the modulation of the spatial compatibility effect as a function of the affective valence of the stimuli. In the present study, we used the names of presidential candidates in Brazil as affective stimuli. The names of the favorite and rival candidates, according to voter preference, were presented to the left or to the right of the screen center, and two mapping rules were used. In Mapping 1, participants made a compatible response with the name of the favorite candidate and an incompatible response with the name of the rival candidate, and in Mapping 2 the rule was reversed. Mapping rule 1 responses were faster than Mapping 2 responses. From the findings, a model based on facilitations and inhibition of ipsilateral and contralateral responses is proposed to explain the task-set effect elicited by the interaction between valence and compatibility.