The public outcry over the Stop Online Piracy Act and Protect IP Act seems to have gotten so loud that even members of Congress can hear it. On Thursday we covered the news that Sen. Patrick Leahy (D-VT) was expressing second thoughts about SOPA's DNS provisions. He said he changed his mind after he "heard from a number of Vermonters" on the issue.

On Friday, several Republicans started backpedaling as well.

SOPA sponsor Lamar Smith (R-TX) announced that he would be pulling the DNS-blocking provisions from his own bill. “After consultation with industry groups across the country, I feel we should remove Domain Name System blocking from the Stop Online Piracy Act so that the Committee can further examine the issues surrounding this provision," Smith said in a Friday statement.

Meanwhile, six GOP senators who served on the Senate Judiciary Committee (which unanimously approved the legislation last year) wrote a letter to Senate Majority Leader Harry Reid asking him to postpone a vote on PIPA to give them more time to study the legislation.

"We strongly believe that the theft of American intellectual property is a significant problem that must be addressed," they wrote. But since the Judiciary Committee last considered the legislation, "we have increasingly heard from a large number of constituents and other stakeholders with vocal concerns about possible unintended consequences of the proposed legislation, including breaches in cybersecurity, damaging the integrity of the Internet, costly and burdensome litigation, and dilution of First Amendment rights."

The current plan for the full Senate to consider the bill on January 24 "may not permit us to work through many of the concerns that have been raised," they warned.

Lest anyone doubt the signers' tough-on-piracy bona fides, they include Orrin Hatch (R-UT), who once proposed that Congress give copyright holders a special exemption allowing them to hack into the computers of those suspected of piracy. In a 2003 hearing, he suggested that damaging someone's computer "may be the only way you can teach somebody about copyrights."

Another member of Congress that has been feeling the heat from voters is Rep. Paul Ryan (R-WI). After reddit members raised $15,000 in 48 hours for his anti-SOPA challenger, Ryan came out with a clear statement of opposition to the legislation.

"It appears that lawmakers are beginning to realize how much damage their anti-'piracy' bills could cause to the Internet and to Internet-related businesses," said Public Knowledge's Sherwin Siy in a statement. "While we are pleased that some progress is being made, we are also firm in our opposition to both bills because some very bad provisions remain."

Washington insiders hold disproportionate sway on Capitol Hill. But members of Congress are ultimately chosen by American voters. When enough of them express a strong view on an issue, members of Congress do pay attention.

Update: The Obama administration has come out in opposition to SOPA in its current form. House Majority Leader Eric Cantor has also promised that SOPA will not proceed to a vote until "consensus" has developed.