Unfortunately, the ad that trumpets his zero rating from environmental groups that Brown has out now is a back breaker.
If he wins and disqualified, Poochigian shouldn't automatically be declared the victor. I would imagine Arnold would appoint to fill a vacancy and a special election may have to be held.
However, I expect the courts will say the Secretary of State is to blame, that people voted in good faith for Brown, etc., etc. and they'll let Brown slide in.