So I'm not especially clear on this - how exactly could the Dems have "codified Roe into law" or "pack the courts"? So far as I'm aware for example Roe WAS law - it was an explicit Supreme Court decision that the 14th Amendment made abortion legal and you can't get more codified than that.
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More to the point, there's not actually a very significant period of time when this is possible - it's about four months in 2009, the period in which the ACA was hammered out and got through.