When Hillary Clinton was on the Wal-Mart board, it was well before it was even a national chain. In addition, she was the first lady of Arkansas. Helping a business grow in Arkansas grows the tax base for their residents. And that is good for the people there. What Wal-Mart looks like now leaves much to be desired, but Hillary is often held to past circumstances by today's standards and it's completely unfair. We need to take a step back and appreciate context more as a voting population, because when you do, you can find more substantive intentions rather than the surface level noise.
Hillary Clinton, as well as other politicians, do not support working class people. Working class people so not provide financial support and therefore are a non entity to most politicians, Clinton included. The only thing she wants is working class votes and then, if elected, she will do what benefits her career.
Clinton has lived life in the upper class for far too long to be a supporter of the working class. She's had all the trappings of wealth and power for the last two or three decades and I doubt she can relate to the problems of the working class let alone support them in anything.
Clinton says she a supporter of the working class, saying that she will not raise taxes for households that earn over $250,000. However, that is not the working class. Sanders has been very vocal about higher taxes for the wealthy, which makes him the stand out supporter for working class.