Democrats have indeed codified Roe into law in states where they can. Federal law doesn't really work that way though, which is probably why Roe was recognized through penumbras of the constitution or however they would say it. It all gets a bit silly and pompous when we take it to the priests of the law in funny robes, but the practical results of Roe were an almost perfect compromise and undoing it does not seem like a good idea to me.