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Studies of online campaigning have consistently demonstrated a positive impact on electoral success, but it remains unclear how this occurs. Some find the content and style of post matter, while others have pointed to overall activity as the key driver, promoting a “broadcast” effect model. Still, others have argued for indirect effects whereby candidates rely on followers to share content within their networks. This paper develops a “joined-up” model to test these arguments that includes new measures to capture the responsiveness of candidate tweets and the extent of user engagement. We apply the model to the 2017 UK General Election Twitter campaign. Our findings confirm a digital campaign effect, but in a two-step rather than direct manner. Specifically, candidates that attract more engagement with their tweets (likes and retweets) enjoy more electoral success. We expand on our findings to argue for a “network” rather than “broadcast” model of digital campaign effects. [ABSTRACT FROM AUTHOR]