The seating of the Eisenhower Texas delegates locked it up for Ike. And the best way to do this often is to raise the issue of fairness. Then put the vote on national television, where establishment regulars don't want to be shown looking like slimy hacks. It was Bill McInturff's turn to speak. The bearded pollster had a sheaf of papers in his hand from the overnight tracking polls.
Voters are very touchy about the sanctity of the ballot.
It would build on itself because his natural base is people that don't trust political insiders. But you're right, we have an issue that we can talk about, and people will listen. Then, when we get to Philadelphia we take it all the way to the floor. The key votes will probably be on arcane procedural matters, like whether the challenged California delegates should be allowed to vote on the issue of their own seating. That's the way it's been in the past.