Dark Money
But efforts to increase disclosure of dark money also took a hit.
It's making political spending less and less transparent.
At issue is a provision slipped into a must-pass budget bill.
The group is headed by a Marco Rubio supporter.
WHAT'S HAPPENING
Secret money flowed through multiple groups to aid Tillis, McConnell.
The billionaire brothers' main political arm raised $126 million in 2014.
Efforts to circumvent the coordination ban have grown more aggressive.
Democrats and reform groups want the president to issue an executive order on campaign finance disclosure.
The author of the controversial opinion should have known, even in 2010, that his "instant disclosure" fix didn't exist.
The billionaire says other candidates are breaking the law.