Related; Did Ron Paul Just Endorse Bernie Sanders?
Why is this important? Well for a couple reasons. For one Van Dyke is 90 years old and because he has been around and in the entertainment industry for 70 plus years he has seen his fair share of corruption and chicanery inside and outside of the industry, and maybe more importantly this is the first Presidential candidate Van Dyke has felt passionately enough about to publicly endorse in almost 50 years.
Another important message that can be seen as a positive for the Sanders campaign is that this runs counter to the theory that Sanders is a millennial candidate who only appeals to the young