Bill Kristol makes a good case. His conclusion:
So House Republicans should help pass the bill. I think it's the only responsible thing to do in terms of the economy. But I also think it's the only way McCain has a chance to win. To those House Republicans who care about conservative principles, about limited government and free markets--I'd ask this: How much damage will a president Obama and a Democratic Congress do to the causes you care about? Electing McCain gives us the best shot at solving this crisis in a way that doesn't lead to a permanent and perhaps irreversible expansion of the size and scope of government. Following up on Sarah Palin's victory, principled House conservatives should vote yes tomorrow. Passing the bailout would give McCain a fighting chance to win, which in turn provides the best chance--the only chance--for conservative principles to prevail in the next few years.