Costello: Makes Pythagoras Look Like An Idiot

The Simon Crean of the Liberal party (except Costello has no balls) today claimed that Labor's tax policy was wrong by $700m.

(now watch me put the spin on this, this site is Completely Biased after all)

Is this a case of pot kettle black, considering Costello's budget surplus turned out to be $3.5 billion off his predictions, or that $3 billion in GST revenue had "unexpectedly" appeared? That's like $6.5 billion out of whack, yet he's claiming Labor can't add?