The issues Sanders cares about are important to resolve long term, but they will not win the election.
But would get a very large portion of voters interested enough to vote in Nov. Lately most people in both sides (except MAGAs, them too braindead) is they are tired that the elite control everything, and while the Harris campaign might not turn the majority of Republicans, it may get the centrist and left energized that there might actually be change coming and vote.