Thought expirment

Let's assume for a moment that the bailout doesn't turn out to be cost free. Let's assume instead that months and months from now the government sells these troubled assets at a loss of about $100 billion. Let's further pretend that, at about the same time, President Obama wants Congress to pass sweeping health care reforms which also costs $100 billion. So he does his part, under the terms of the bailout legislation, and unveils a new bill that would tax financial institutions to the tune of the $100 billion their assets had cost the taxpayers. He does this as either as a standalone measure or as a rider to the health care bill itself. Realizing that the Democrats want to pass any number of costly reforms, what's to stop the 41+ Republicans in the Senate from filibustering it and then saying there's no money to pay for Obama's agenda?