Just talked to a Senate source: They’re close to a deal where the Republicans who voted to filibuster the Patriot renewal will switch sides on the romise that their concerns will be addressed by the end of May (“a vote on a package of ‘reforms’). But: “even if we keep the dems we had on the last vote, we are still three shy of cloture. McCain is gone, so that means we’re four short. We have to convince four more dems. I’m not holding my breath.”