Here are the key senators that could swing the vote either way.

A couple of weeks ago, the Senate tried to sneak a rider onto a spending bill that would give the FBI sweeping new surveillance authority, including warrantless access to browsing history (obtained from ISPs). This measure failed by one vote after thousands of people called their senators using a phone tool we set up at www.decidethefuture.org and 1-919-FREEDOM.

Now, Republican leadership is planning to re-introduce the measure (McCain Amendment 4787) and do a re-vote this week. Even though we won the first time, the razor-thin margin means this upcoming vote could really go either way. It all boils down to a few key senators who are undecided or likely to change their minds.

Click here to see where your senators stand on this dangerous bill.