From a reader:

Harriet Miers has been staring down into the legal abyss created by the War on Terror for four years. She’s no doubt more acutely aware of the
strains in our Constitutional system than any of the heavyweights the
President passed over. There are those who are serious people because
they need to be serious people, and there are those who are serious
because they are called to seriousness by events, not by a mere
predilection to be so.