Were the EU referendum amendment passed, Cameron would either have to resign or abandon centuries of parliamentary convention.
The claim that 8,000 people moved into work as a result of the benefit cap is "unsupported by the official statistics", says the UK Statistics Authority.
With Cameron's party on 27% and Farage's on 17%, the gap between them is now smaller than the gap between Labour and the Tories.
The timing of the move is a political gift to Ed Miliband.
There was little in the speech to revive growth and employment this side of the election. But can Labour take advantage?
Cameron's refusal to introduce a bill committing the UK to spending 0.7 per cent of GNI on aid is a breach of the coalition agreement.
After minimum alcohol pricing and plain cigarette packaging are dropped from the Queen's Speech, Labour and Tory MPs point to the election chief's connections.
If, as Lawson predicts, Cameron's renegotiation strategy fails, the Tory party will suffer its worst split since the reform of the Corn Laws.
Ministers are motivated by the desire to make a quick buck, not by what is best for the taxpayer in the long-term.
At this stage of the electoral cycle, the party needs to be performing much better to justify hopes of a majority in 2015.