The donors who don't show up on the donor list.

"Dark money" doesn't mean illegal money. It means money that passes through a 501(c)(4) or Section 527 entity in a way that strips the original donor off the filing. Both ends are legal. The intermediate step is the point: by the time the money reaches a candidate or an issue ad, the original payer can no longer be traced through public disclosures.

How the chain works

The core mechanic is the same on both sides of the aisle:

  1. Donor writes a check to a national 501(c)(4) "social welfare" organization.
  2. 501(c)(4) makes a "grant" to a state-level 501(c)(4) (or to a Section 527 PAC). Schedule I of the IRS Form 990 reports the grant, but the original donor is shielded behind 501(c)(4) donor anonymity.
  3. State-level entity spends on issue advocacy or transfers to a state PAC. The PAC reports its donor as "the 501(c)(4)" — not the original payer.
  4. Voter sees a glossy mailer with a benign group name. The actual donor is two or three legal hops upstream.

D-side / progressive coordinating PACs

NPE has documented thirteen national D-side coordinating entities with active Nevada footprints:

Per-entity profiles, NV contribution totals, and Schedule I pass-through chains documented at NPE.

R-side / corporate coordinating PACs

The corporate / Republican side runs an equivalent infrastructure:

Plus the NV-headquartered corporate donor stack that NPE tracks at its corporate-establishment page — Las Vegas Sands Corporation and others.

Pass-through hubs

Five organizations function as the bipartisan dark-money plumbing system. The Arabella Network on the left is the most-discussed:

Each hub's NV-relevant grant history and downstream beneficiaries is documented in NPE's dark-money page.

Why "issue advocacy" is the magic phrase

Federal tax law allows 501(c)(4) "social welfare" organizations to engage in unlimited issue advocacy without disclosing donors. The line between "issue advocacy" (e.g., "Tell Senator X to support clean energy") and "express advocacy" (e.g., "Vote for Senator X") is the line between disclosed and undisclosed money. The same vendors who produce one produce the other; the legal classification is the only thing that differs.

Result: by the closing weeks of every NV election cycle, the actual financial sponsors of half the political mail in your mailbox are not on any document you can request.

Sources