Lead a march on DC to stop the FISA bill and stop retroactive immunity.  You can't vote, you can't filibuster, but as you keep saying you can lead.  Show it! Lead people to the steps of the capitol and demand they support the constitution and the rule of law.  Support the basic structure that has allowed the "little guy" to succeed so well in this country for the last two hundred years.  You will shame your opponents into supporting the cause of good, and once again direct the dialog.  You should garner media coverage, though given their blind eye that is not a given, but I think this would be big enough to break through.  But most importantly you would be walking the talk.  And what greater a tribute to MLK than a march on Washington telling them to live up the the ideals of America.

[Update]  john@johnedwards.com is the email to send Edwards you support and request to move on this issue, even if you think a march is silly, send him the request to move on FISA in some way.