Presto Vivace writes "Under the right conditions, online activism can be very effective. U.S. Senator Patrick Leahy has already abandoned his warrantless e-mail surveillance bill we discussed this morning. 'The Vermont Democrat said today on Twitter that he would "not support such an exception" for warrantless access. ... A vote on the proposal in the Senate Judiciary committee, which Leahy chairs, is scheduled for next Thursday. The amendments were due to be glued onto a substitute (PDF) to H.R. 2471, which the House of Representatives already has approved. Leahy's about-face comes in response to a deluge of criticism today, including the ACLU saying that warrants should be required, and the conservative group FreedomWorks launching a petition to Congress -- with over 2,300 messages sent so far -- titled: "Tell Congress: Stay Out of My Email!""