Tomorrow, will be the biggest test by far of the Coalition and Lib Dem support for it. Will we see Lib Dem MPs waving their order papers as Osborne sits down, will they have the stomach to cheer such a tough Budget?
Tory MPs get emailed most days, and sometimes several times a day, by the whips reminding them not to sit on the benches reserved for the Lib Dems—the front two rows on the right hand side of the government benches. But one was joking to me earlier that, tomorrow the Lib Dems might prefer to be hidden amongst the Tories. Certainly, the lay-out of the Coalition benches will provide some interesting contrasts tomorrow: I doubt that many Tory order papers will rise when Osborne announces a CGT hike.
One other thing to look out for is how the Labour leadership contenders react to the Budget. Will their own responses amplify the main Labour message or distract from it?