While David Koch, and his brother Charles, are frequently associated with Republican and conservative causes, David was the Libertarian Party's vice-presidential candidate in 1980. He also sits on the board of the Cato Institute, the nation's most prominent libertarian-oriented think tank.

The revelation that Koch could offer significant financial support to the Johnson campaign came just hours after Johnson announced a running mate who may assist in securing additional funding from another billionaire.
On Wednesday, in a story first reported by The Daily Caller, Johnson chose former Massachusetts Governor Bill Weld as his running mate.

In addition to his credentials as a twice-elected libertarian-leaning Republican governor, Weld recently served as attorney and chief lobbyist for casino mogul Steve Wynn during a fight to secure a state license to develop a resort and casino in suburban Boston.

A source within Johnson's campaign admitted that "Wynn is likely to be a very important supporter" of the campaign as a result of the Las Vegas casino owner's relationship with Weld.

A Koch spokesman initially declined to comment on the record.