My guess is that if he hadn't filibustered the drone program a few weeks ago, he would of used a filibuster here. Seems like he did the math, and two filibusters this close would make him look like an obstructionist.
Not blaming the man, political capital is not free.
What would he be filibustering? There is no proposed legislation to oppose afaik. What needs to happen is the opposite: someone needs to propose and try to push through new legislation curtailing FISA.
Not blaming the man, political capital is not free.