Yes, there is a Democrat in the Senate with balls: Russ Feingold.
On March 13, Senator Feingold said that President Bush should be censured. Feingold wants Bush to be held accountable for breaking the law, arguing that Bush's unauthorized domestic wiretapping is illegal.
Here is a link to the text of the speech calling for censure.
I heard a broadcast of the speech on Democracy Now, and it made my day. It's about time the Bush/Cheney creep machine gets taken to task for their deceitful, reprehensible ways.