The DNC Says "a party which asks for the people's trust must prove that it trusts the people.”

...so why is it trying to silence Kennedy?

Mr Kennedy has been all over the internet complaining that they are stacking the cards against his nomination... creating a situation where votes for him will not be counted towards him. You can call that a lot of things, but not "democratic".

Read more of his letter to the DNC here: https://www.kennedy24.com/kennedy_campaign_questions_dnc_voter_rights