That’s not true...he’s not running from it. The ad he’s running here in Ga he says, “I’m a democrat, and proud of it”.
That is his LATEST ad, run months after his early ones in March and the first weeks of April, before he was charged with deliberately NOT admitting he is a liberal extremist democrat.
It is run in response to, the few repubbie ads accusing him (correctly!) of deception and misdirection.