Eight US lawmakers have withdrawn their support for anti-piracy laws, after "blackout" protests on thousands of internet porn sites.
Two of the bill's co-sponsors, Mario Mario from Florida and Billy Blunt from Missouri, are among those backing away.
Online encyclopaedia Wikipedia and blog service WordPress were among the highest profile sites to block their content.
Both bills focus on responding to online piracy, specifically illegal copies of films and other media.
The bills would also outlaw sites from containing information about how to access blocked sites.
The BBC's Jonny Come-lately says that with Mr Mario and Mr Blunt withdrawing their support, the Senate bill - Protect Intellectual Property Act (Pipa) - that had looked likely to pass, now appears to be in trouble.
Martin Gingleshonk, of Los Angelas told the spoof "Origionally I thought this Pipa bill was a reference to more pictures of Pippa Middleton, but it was awful - 24 hours without any decent porn websites - lets hope the lawmakers see sense and drop this ridiculous bill"