It's up to the individual to decide if they feel their issues are "invisible" to Bernie Sanders or Hillary Clinton. Some folks might think his platform does enough to tackle institutional racism, others would think he is pandering and disingenuous.
In the end some people will decide that Hillary is the person who will champion their issues while others will decide Sanders. There is nothing wrong about either position and everyone is free to make up their own mind. This is why there is a process in place to choose the nominee. In the end of the day we are not choosing a Presidential Candidate of a hungered different factions and you don't have a yuge field of candidates to choose from - every person needs to find what the most important issues are and usually they would choose whichever candidate they feel is most genuine about tackling them
In the end some people will decide that Hillary is the person who will champion their issues while others will decide Sanders. There is nothing wrong about either position and everyone is free to make up their own mind. This is why there is a process in place to choose the nominee. In the end of the day we are not choosing a Presidential Candidate of a hungered different factions and you don't have a yuge field of candidates to choose from - every person needs to find what the most important issues are and usually they would choose whichever candidate they feel is most genuine about tackling them