A polished and provocative video, circulating among Tea Party activists, seeks to raise a “cavalry” to march on swing states and identifies True the Vote as a participant in the effort, called Code Red USA.
In the past year, Americans for Prosperity, an organization founded by the billionaire Koch brothers, and other Republican-leaning independent groups have sponsored meetings featuring Ms. Engelbrecht and other True the Vote speakers. A spokesman for Americans for Prosperity said that the group had hosted events including True the Vote speakers but that election integrity was not a focus of his group.