Here is a new and creative way for citizens against retroactive immunity to make their voices heard.  Commenter Diverik just brought this to my attention:

Anybody who wants to support Sen. Dodd and Feingold in their opposition to retroactive immunity can become an online citizen co-sponser by going here:

http://advomatic.bm23.com/public/?q=landingpage&fn=Mail_LandingPage_Link&id=1c1sal9lif76e2hlphhjcjllpc0d9&page=subadd&type=p&ssid=9531