Literally how

Dude you didn't address anything I said, just a glib catchphrase that's frankly wrong. But in good faith I'll discuss:Depends on the circumstances. Clinton and Biden running against incumbents had to be even more center, although Biden is acting more left than what he ran. But you want to suggest Obama with Obamacare was right? Yeah no. And Biden is left than what he ran: IRA, chips act, marijuana, etc. Sorry your little catchphrase is inaccurate.

And if you want even more inaccuracy, get dem president and Congress majority for 20 years straight and watch it move. Because, as I said, you can't do what you want when there's a real chance of losing. Then more left ideas in the party get more attention and traction. Which is, you guessed it, the Overton window.