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There is a vast empirical literature on the allocation of corporate PAC contributions in Congressional elections and the influence that these contributions have on the policy-making process. The attention given to PAC contributions is far in excess of their actual importance. Corporate PAC contributions account for about 10% of Congressional campaign spending and major corporations allocate far more money to lobbying or philanthropy than their affiliated PACs make in contributions.
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Milyo et al. (2000) studied this question.
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