Procedural arguments in the form of phone-banking scripts were distributed by the campaign, but Obama volunteers were not rigid, unwavering machines. They did not always execute the campaign’s code, or at least not in the way that we normally imagine the process of execution.
This is a fascinating application of Bitzer through Roundtree's expansion. The campaign understood the ways that successful interactions don't exist waiting to be discovered, they must be engineered by situational awareness, finding a relative understanding between the two who conversed, regardless of their relative positions. That's the strength of a volunteer on the ground.