This paper explores how proactive behavior and constructive deviance relate to affective organizational commitment and turnover intention through idea championing. Based on a two-wave study (N = 310), structural equation model analyses revealed that constructive deviance had an inhibitory effect and proactive behavior a facilitatory effect on idea championing. In turn, idea championing was related to increased affective commitment and reduced turnover intention. The analyses of indirect effects further indicated that proactive behavior and constructive deviance had opposite indirect effects on affective commitment and turnover intention. This research underlines the importance of acting proactively upstream rather than deviating from the norm to promote innovation and build employee loyalty to the organization. Finally, this study also indicates that proactive and constructive deviant behaviors are conceptually different and exert opposite effects despite their similar orientation toward innovation and change.