National Institute on Money in State Politics

In modern American politics, cash is king. Hopeful candidates tap into donor networks, amass millions in contributions, and bury their opponents under a mountain of ads. The strong survive, and the weak are spent into oblivion.
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Ravel also would like to require the disclosure of the top two contributors above $50,000 on any print advertisement paid
Political committees controlled by Mitt Romney's campaign have made generous donations to prominent Republicans in early primary states, but records show contributions have tailed off as the GOP nominees head in to Super Tuesday.