The only concerns I would have about this are violence and bribery.
If the Left knows who these people are, where they live, where they work, where their children go to school, then there is a chance of blackmail and extortion. The Left have a proven history of violence and they are openly saying that they are willing to kill to get Hillary elected.
We know that Soros and a few Arab entities abroad are funding the riots and they have an unlimited amount of money. If they were to approach these people and tell them that a switch will get them a million dollars, or five million dollars, or ten million dollars, then it may be hard for them to say no.
I hope the delegate are under secret service protection. If they are not, they should be for sure. There is no limit to what the Left will do to achieve their goals.