That's carrying the "decorum" of the Senate too far, IMO. If you wanted to debate someone--assuming you have no priviledged evidence no available to your debate partner--why would asking an obvious question be considered "blindsiding?"
What should've Hatch done--provided her with the question in advance, so she could side-step with a contrived answer?
Conservatives should never be "afraid" to win a debate. We should be tactful and good sports, but never afraid to win with a sound argument.