A small nonprofit called the Judicial Crisis Network poured millions into a campaign to stop the Senate from confirming Barack Obama's Supreme Court pick last year, and then spent millions more supporting President Donald Trump's choice for the same seat. JCN's money came almost entirely from yet another secretive nonprofit, the Wellspring Committee, which flooded JCN with nearly $23.5 million in 2016. Most of Wellspring's funds, in turn, came from a single mysterious donor who gave the organization almost $28.5 million. Like JCN, Wellspring - at one time tied to ... conservative industrialists Charles and David Koch - is a nonprofit that is supposed to be dedicated to social welfare functions and doesn't have to disclose the names of its benefactors. Since the 2010 Citizens United Supreme Court decision loosened certain constraints on political spending, these and other ... groups have become increasingly politically active while providing anonymity to their donors. Wellspring Committee acted as a dark money conduit to provide an extra layer of secrecy to whomever was bankrolling the Judicial Crisis Network ads," [said] Brendan Fischer of the ... Campaign Legal Center. "This has the effect of layering secrecy on top of secrecy, and almost entirely insulating donors from any form of public accountability." The American Future Fund, another former Koch "dark money" nonprofit, pulled in $2 million from Wellspring last year. It spent more than $12.7 million in 2016 federal elections without disclosing its donors.