Yes. Did he change, or did he just get better at hiding who he was? This indication of mental instability, plus his seeming fondness for Al Sharpton, gives me a very bad feeling about him.
Here's a youtube video of Carson at Sharpton's National Action Network event back in April. Carson comes on at 21:21. Sharpton makes a point that he and Carson disagree about many things politically, but the fact remains that Carson came to the event, and his presence lent a degree of respectability to Sharpton. Imagine the reaction if Trump had shown up at a white supremacist event!
If Trump went to see David Duke or showed up to some thing like a KKK rally, he would get run out of America faster than you could say stop....