I think we should wait and see. There's a good chance his numbers plummet after the liberal media gives him the Bernie/Yang/Tulsi treatment. The democratic base is much more cultish to the media than the Republican base is.
You mean the liberal media that came out against Biden when he took away their beloved war in Afghanistan? I'm being a little hyperbole here, though I just don't see a general liberal bias of the entire media. MSNBC is known for a liberal bias, though reality often has a liberal bias.
More likely Kennedy's poll numbers plummet after more Dems find out his anti-vax and pro life stances, among others, are way out of touch with the party.