Abstract
This paper uses a sample of recent Senate election results and estimates vote equations that show challenger spending hurts, and incumbent spending helps, incumbent re-election. While both types of spending have diminishing returns, the effects are asymmetrical. Challenger spending is more productive at lower levels of spending, but incumbents can spend greater amounts more profitably than can challengers. These results can explain why Senate incumbents spend money, why they typically outspend their challenger, and why incumbents who can outspend their challenger would tend to be against spending limits or public financing.
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