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Outside groups made possible by court decisions aired more ads than GOP candidates in presidential primaries.

Behind the numbers

Methodology behind assigning our transparency letter grades to super PACs and nonprofit groups.

The five super PACs with the most money in the bank are all alligned with Democrats.

Harvard law professor Lawrence Lessig cites Center article in calling for FEC hearing.

Political cash machines of many top government affairs shops see a slow start to 2014 election cycle.