Congresswoman Gabrielle Giffords Shot at Arizona Event

[Kiva]

from CNN:

Paul Callan, a criminal defense attorney and a former prosecutor, and Jeff Gardere, a clinical and forensic psychologist, said on CNN's "American Morning" on Tuesday they have doubts that an insanity plea would stand.
With the "amount of planning that went into this assassination," Callan said he believes "it's highly unlikely he will meet the legal insanity defense threshold."
"It's very hard to prove insanity at trial," he said. "You really have to prove that your mental illness is so severe that you don't even understand that you're committing a criminal act. And it's almost impossible to prove that.

so, legally, doesn't sound like he's getting insanity plea through...however, i will be very curious to see what sorts of mental health diagnoses are thrown out there...