"Del Mastro surprised many by not making a motion at the ethics committee to summon former Liberal staffer Adam Carroll — who has admitted he was behind the Vikileaks30 campaign — to testify at the committee."
I'm actually pleasantly surprised by Del Mastro's stopping to think before he spoke - unlike his first blast referenced in the linked article. See, if the Tories called a Liberal staffer to testify, it makes them hard to deny the Opposition to call Conservative staffers before committee as well.
See the benefits of proactive planning vs. reacting? When you look ahead, you not only make better decisions - you ultimately save yourself grief as well.