Before suggesting that Alberto Gonzales is an acceptable Supreme Court nominee, I encourage you to read about his role as advisor to President Bush on clemency decisions. Objecting may be pointless, as TChris points out in the comments here, but that doesn't mean we have to give him a thumbs-up:

If he had a prosecutorial bias in a job that required him to provide a dispassionate and even-handed evaluation of a conviction and death sentence, it stands to reason that he would have a pro-prosecution bias if appointed to the Supreme Court. That alone should disqualify him, although it wasn't enough to stop the appointments of Rehnquist, Thomas, Kennedy, etc.

Don't miss the full Alan Berlow article in the Atlantic Monthly, available free here. He begins:

As the legal counsel to Texas Governor George W. Bush, Alberto R. Gonzales, now the White House counsel, and widely regarded as a likely future Supreme Court nominee, prepared fifty-seven confidential death-penalty memoranda for Bush's review. Never before discussed publicly, the memoranda suggest that Gonzales repeatedly failed to apprise Bush of some of the most salient issues in the cases at hand

Nat Hentoff had this Village Voice column on Gonzales and the death memos. John Dean weighs in here.