Does the local organisational presence of anti-immigrant parties affect their chances for electoral success? In order to answer this question, the article explores the potential of a supply-oriented explanation to anti-immigrant party success by examining the electoral advancements the Sweden Democrats (SD) made in the 2006 and 2010 elections. Our results indicate that traditional demand side-explanations to anti-immigrant party success can be successfully complemented by a ‘internal supply-side argument’ to make the electoral fates of these parties more intelligible. Whether the SD had a local organisational presence had a substantial effect on its results in the national election and on the probability of gaining representation in local councils. Thus, the party´s fate in the national as well as local elections was largely determined by whether or not it had a local organisational presence in Swedish municipalities.