In the comments to this question, a small debate emerged about the influence of money on politics. Therefore my question:
- Does campaign spending correlate with popular vote?
The answer might depend on the situation. I am interested in all kinds of elections that are considered "free and fair" according to independent observers: local, regional, national elections; elections of parties to parliaments or of individuals to offices; in North America, Europe, or elsewhere. There are probably many examples, so I'm mostly interested in systematic studies.