Some good news on the SOPA front: its corporate base of supporters is starting to crumble.

One of the few Internet-based organizations to support SOPA, the Stop Online Piracy Act (referred to by supporters as the Internet censorship bill), was GoDaddy.com, the domain name registration site that manages over 51 million domain names across the Web. When the coalition opposed to SOPA found out about this, they kicked off a grassroots campaign to pressure GoDaddy, mainly by telling people who have registered domain names with them to find another vendor. This had the intended effect. GoDaddy today renounced its support for SOPA.

Go Daddy is no longer supporting SOPA, the “Stop Online Piracy Act” currently working its way through U.S. Congress.

“Fighting online piracy is of the utmost importance, which is why Go Daddy has been working to help craft revisions to this legislation – but we can clearly do better,” Warren Adelman, Go Daddy’s newly appointed CEO, said. “It’s very important that all Internet stakeholders work together on this. Getting it right is worth the wait. Go Daddy will support it when and if the Internet community supports it.”

GoDaddy is not alone. Scores of law firms are requesting their names be removed from the Judiciary Committee’s official list of SOPA supporters. This follows on companies listed by the Chamber of Commerce as supporting SOPA asking to be taken off the list.

The dynamic is clear. Once SOPA (and its Senate counterpart Protecting IP Act, or PIPA) became high-profile among the Internet community, the lazy endorsements from companies and various hangers-on became toxic. And now those supporters are scrambling, hollowing out the actual support for the bill. Suddenly, a bill with “widespread” corporate support doesn’t have much support at all. And remember, the corporate support was the only thing propping up SOPA; it’s not like there’s a grassroots army urging Internet censorship.

This is very good news for the coalition opposing SOPA as we head into markups next year.