For Bush to win without Ohio, he would need to take Florida and either Penslyvaina or the lions share of the other toss-ups.
Really all he'd need is 2 or 3 toss-ups not a "lions share" unless he loses Florida as well as Ohio but he does not need 2 of these large states.
Ohio=20
MI+WI=27
MI+MN=27
MI+IA=24
MI+OR=24
MI+NM=21
MI+ME=21
WI+MN=20
Under these scenarios Bush could win every state he won in 2000 and lose OH, WV and NH but still win or tie the electoral college if he picked up any of the above combinations.