New Economic Secretary Andrea Leadsom said during the 2012 Libor row: "Obviously he made a mistake and I think he should apologise to him."
For the sake of a day of good headlines and a few billion pounds of extra tax, the Chancellor has put years of painful progress at risk.
Party's decision could lead to backbench rebellion.
The party says "It’s the same old Tory con – giving with one hand while taking away much more with the other."
Shadow chancellor says 10p tax rate would benefit two-thirds of married couples, while tax allowance would help just one-third.
The Chief Secretary to the Treasury contradicts Osborne and says the idea is "well worth further consideration".
The party pledges to fund the policy for the whole of the next parliament by introducing a bank bonus tax and restricting pension tax relief for those earning over £150,000.
Ed Balls's emphasis on the long-term benefits of investment in flood defences is an example of how the party could challenge the Tory narrative on public spending.
Shadow chancellor's comments suggest mood in the party is hardening against an in/out referendum.