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Will Obama’s rule stem tide of dark money?

The Obama administration unveiled a new rule aimed at making it harder for groups like Karl Rove’s to pour money into elections. But the impact is unclear.

US President Barack Obama arrives at Seattle-Tacoma International Airport, Nov. 24, 2013.
US President Barack Obama arrives at Seattle-Tacoma International Airport, Nov. 24, 2013.AFP/Getty Images

Zachary Roth