Report: Dark Money Playing Record Role in Battle for Senate Majority

Report: Dark Money Playing Record Role in Battle for Senate Majority:  Outside spending is playing an unprecedentedly large role in the nine races most likely to determine which party controls the U.S. Senate. A record amount of this money comes from "dark money" groups that conceal their donors and single-candidate groups 

http://www.brennancenter.org/press-release/new-report-outside-spending-dark-money-playing-record-role-battle-senate-majority