Dayton, 35, self-financed his campaign. Married to a Rockefeller and heir to a department store, his net worth was an estimated $30 million. Durenberger, who in 1978 and won the special election to finish the term of the late Hubert Humphrey , was largely unknown. He was considered a moderate, but supported Reagan's tax cuts. Dayton ran against Reaganomics. He has also campaigned against tax breaks for the wealthy and even promised "to close tax loopholes for the rich and the corporations—and if you think that includes the Daytons, you're right." By the end of September, the senate election already became the most expensive election of all-time, with over $8 million being spent. Dayton spent over $5 million, while Durenberger spent over $2 million.