Ed Miliband's PPS John Denham warns Labour not to assume it will be able to govern alone after the next election.
Tribal differences have obstructed progressive change in the past. They must not do so again.
The party's surge will make it harder for the Tories to take seats off the Lib Dems and could revive the debate around electoral reform.
Labour secured comfortable victories in yesterday's three by-elections, while the Lib Dems finished eighth in Rotherham.
Sarah Teather dodged a vote the first time round, now she has sided with Labour.
Higher taxes on the rich will not protect the poorest if spending is slashed.
A fall in support for the Lib Dems will propel Labour to victory in Tory marginals.
Coalition negotiations over the Autumn Statement are fraught but there is one wheeze that could help the Chancellor.
The Energy Secretary has been undermined and humiliated by the Chancellor's machinations on wind power. He must reassert his authority.
Source close to Clegg insists "election will be on old boundaries".