It is gaining traction with leftists that don't understand how FPTP voting works. Just educate them. Every single right-wing anchor they try to attach to our society can be destroyed with education and information.
This is the classic pincer manoeuvre of the right and mainstream media: the left wing candidate is always both too left and not left enough at the same time.
And they reinforce it with shitty opinion pieces of “all sides”. Anything to minimise left wing gains and keep the ratchet going.