I want to point to one snippet from the article to make a point about the death penalty, however:
"Schwarzenegger, weakened by a loss on all his initiatives in a special election he called last month, would have risked alienating his Republican party if he granted clemency."
This is not to say that der Gropenfuhrer definitely made the decision because he caved to his base, but it is possible. And the fact that external politics is a possible factor in decisions to kill someone or not is, in my opinion, a huge argument against the death penalty.
In other words, if the decision whether or not to let you live is being made by someone thinking more about their next election (and it would, in almost any case, be made by such a person), then maybe giving them that decision in the first place was a bad idea.