No sources, no names... just an article planted by Deplorables designed to fit into the Trump narrative that he is the victim of reverse racism. Deplorable.
I agree with you about articles with "unnamed sources" or "sources close to the campaign" are all useless. That could be harambe for all we know. (most trump stories are like this)
In this story though some names were given. for ex. Tracy Sefl, a Democratic consultant and Clinton surrogate and Pennsylvania governor Ed Rendell, who this week said he'd like to see Clinton “smile more” in the debate so people can actually ask them what they meant by their statements and if it is true or not.