The Dallas Morning News gets hold of Clinton caucus "training materials," in which supporters are instructed to fight for procedural control of caucuses.

The materials say in part, "DO NOT allow the supporter of another candidate to serve in leadership roles."

It goes on to say, "If our supporters are outnumbered, ask the Temporary Chair if one of our supporters can serve as the Secretary, in the interest of fairness.

"The control of the sign-in sheets and the announcement of the delegates allotted to each candidate are the critical functions of the Chair and Secretary. This is why it is so important that Hillary supporters hold these positions."