I think blacks would be game to join in, if they are invited
Or if whites showed up.
Police Called on Americans who were Protesting Immigration Reform/Amnesty
http://jamielshawsblog.blogspot.com/2014/07/police-called-on-americans-protesting.html
You are no doubt right.
I've seen quite a few express their opposition to the influx of illegals and the money Obama is spending on them.
But facts never interfere with the playing of the race card by liberals.