Ashcroft I don't think has the heaviosity, although he's been a prosecutor. One usually has to nominate either a judge to SCOTUS, or an ex-President. Which brings me to the wild-card possibility, that Dubya might nominate his daddy to the High Court. After all, President Taft wound up on the Supreme Court.
And Bush Senior is the original, wild-and-woolly RiNO. He was a RiNO before the acronym RiNO was invented -- a Rockefeller Republican, Skull and Bones, you name it. The liberals would love him, he'd be confirmed by acclamation. Remember, you heard it hear first. "In the dark!"
Luttig is with the 4th Circuit Court of Appeals. He has reinstated Virginia's ban on partial-birth abortion, and has issued other decisions that warm the hearts of the pro-life lobby.
Regarding Ashcroft, the nomination of a prosecutor with no experience on the bench is not without precedent. Antonin Scalia and William Rehnquist had no previous judicial experience, both having served as assistant US attorney general -- Scalia for three years and Rehnquist for two.
I am skeptical about the nomination of George H.W. Bush as a Supreme Court justice. At this point, the ideological conservatives in the party are adamant about putting pro-life judges on the Court who will be there, issuing pro-life decisions, for the next 30 years. He fails on two counts: he's too old, and he's not sufficiently pro-life.