Story highlights Conservative megadonors the Koch brother are hosting a summit this weekend

They've invited former Hewlett-Packard CEO Carly Fiorina as well as Scott Walker and Marco Rubio

Washington (CNN) Longshot presidential candidate Carly Fiorina has won an invitation to the powerful Koch Brothers' donor summit this weekend, an opportunity for her to impress some of the Republican Party's most well-heeled contributors.

Fiorina, with little money and little support in early polls, will appear at the Freedom Partners Chamber of Commerce's semi-annual event this weekend, the organization confirmed. The line-up in California was first reported by USA Today.

Joining Fiorina will be Wisconsin Gov. Scott Walker, former Florida Gov. Jeb Bush, Florida Sen. Marco Rubio and Texas Sen. Ted Cruz. Fiorina's inclusion at the exclusive retreat comes as Kentucky Sen. Rand Paul, who reportedly performed poorly at the Brothers' most recent "seminar" in January, will not court the powerful this weekend. Though the Kentucky Republican is not scheduled to attend, Paul spokesman Sergio Gor said he was invited to the event and could drop in.

Fiorina, Walker, Bush, Rubio and Cruz will all speak at a forum that will be live-streamed to media, a rare view into what has historically been a very private, secret weekend.

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