Don’t think it’s legitimate to blame anyone for the legalization of abortion; as this was mandated by executive fiat by the Supreme Court.
Personally, I think this falls squarely onto individual states to determine the legality of this issue. I know how I would vote (we would be in agreement, I’m sure) - but no one person can overturn this. The SCOTUS has made that decision for all of us.
Mitt Romney was pro-abortion before ROE v Wade, the left fought for abortion and got it in 1973, it is unlikely the Court decision would have been simply pulled out of the air and dumped on America without the political war of the pro-abortion forces, like the Romneys.