I don't know why or where you got that he was racist. I would like to see examples if you know of any, though.

I'm not sure if Bernie actually accused Hillary Clinton of cheating, because he doesn't seem like that type of person. However, there was a lot of controversy around Super Delegates, which essentially rigged the election in favor of Hillary Clinton, but she herself had nothing to do with super delegates. Then emails released of the DNC criticizing Sanders and basically supporting Clinton, which they definitely shouldn't, but I don't think there was any action that would justify saying Clinton cheated. As for Trump, there's about 0 chance he cheated to win the primary. The DNC didn't like Sanders, and he lost. The RNC didn't like Trump, but he won. Trump definitely didn't have the support of the RNC to even allow cheating in favor of him.

I think Trump at least has a chance to change the way government works, setting precedent for non-politicians to come into politics, changing the election process as a whole. Although, the more I hear him talk, the less I believe any change would happen if he wins.