While everyone's attention was on the equal marriage debate , the Conservatives suffered a significant defeat  in the House of Lords over press regulation. Taking ministers by surprise, peers voted by 272 to 141 to introduce a low-cost arbitration system for victims of press defamation, one of the key recommendations of the Leveson report.
Since those papers that do not join up to the system could be punished by courts awarding greater damages and costs, the proposal represents a form of the state-backed regulation that David Cameron has unambiguously rejected. The rebellion notably included senior Tory peers such as Lord Ashcroft (yes, the billionaire party donor and media mogul), Lord Fowler, Lord Hurd and Lord Astor, Cameron's father-in-law. The economist Robert Skidelsky, a crossbench peer and NS contributor , noted that some peers had described the amendments as "Leveson by the backdoor" and added: "To my mind, that is an important merit of the bill because we are unlikely to get Leveson through the front door". Lord Fowler described the move as a "building block in implementing Leveson - a kind of stalking horse".
If the Conservatives want to avoid "Leveson by the backdoor", they will now need to overturn the amendments in the Commons. With Labour and the Liberal Democats both in favour of state-backed regulation, this could prove a challenge for the government.
For now, the long-stalled cross-party talks on Leveson continue, with the parties next due to meet on Monday. During the debate, Lord McNally, the Liberal Democrat leader in the Lords, promised that the government's proposal of a royal charter to oversee press regulation would finally be published next week. As IPPR's Tim Finch noted  on The Staggers on Monday, Labour has not ruled out supporting this compromise. In her speech at the think-tank's recent Oxford Media Convention, Harriet Harman, the shadow media secretary, said she was "unpersuaded" by the idea but actions speak louder than words; Labour failed to follow through on its threat to force a Commons vote on its own draft bill  in January if the government failed to bring forward  satisfactory proposals by Christmas. Moreover, as Tim wrote, "being unpersuaded is not quite the same as being unpersuadable".
The government is confident that the Lib Dems, and possibly Labour, will unite around the proposal of a royal charter. But last night's Lords defeat means Clegg and Miliband now have a powerful bargaining chip.