Mary Katharine Ham is on Capitol Hill reporting on Attorney General Eric Holder's testimony to Congress and capturing lots of very interesting exchanges on Twitter: Holder says: "Failure is not an option. These are cases that have to be won. I don't expect that we'll have a contrary result." To which Senator Grassley replied: "I don't know how you can say failure is not an option...I'm a farmer, not a lawyer, but it seemed to me ludicrous." As Senator Kyl said, "How could you be more likely to get a conviction in federal court when [KSM] has already asked to plead guilty to military commission?"