Voters are beginning to learn about Republican presidential hopeful Marco Rubio.
What they're not learning, however, is who is paying to promote his candidacy.
The Florida senator is benefiting in unprecedented ways from a nonprofit group funded by anonymous donors. While other presidential candidates also have ties to secret-money groups, the Rubio arrangement is the boldest.
Every pro-Rubio television commercial so far in the early primary states of Iowa, New Hampshire and South Carolina has been paid for not by his campaign or even by a super PAC that identifies its donors, but instead by a nonprofit called Conservative Solutions Project. It's also sending...