Certainly Marco Rubio is going to hear much about the Conservative Solutions Project in the next debate if not sooner. Rubio has quietly and quickly become the king of "dark money". While all candidates have Pac's and SuperPacs Rubio has taken it one step further. The Conservative Solutions Project which has purchased over $8 million in television air time is a 501 (c) (4) just as are most Tea Party groups. Under the law they can be formed to promote “social welfare,” but not simply promote a single candidate. CSP is promoting Rubio but as a 501 (c) (4) is not required to reveal its donors. What CSP is doing is tantamount to the Perrysburg Tea Party spending money on behalf of, God forbid, John Kasich.
Evidently CSP is brazenly ignoring tax law knowing that there will be no consequences until after it files its tax returns and the primary is decided and in the meanwhile it is keeping its donor list private. Who are these people? They could be anyone from Mark Zuckerberg to La Raza.
Read more here, here, here and here.