Sources say senior figures such as Harriet Harman, Ed Balls and Yvette Cooper were not given the chance to make high-profile interventions.
The party is on course for its best result in London since 1998 and has won in some key general election targets.
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The party held onto Eastleigh and Sutton but lost Cambridge and Kingston.
The party has gained 82 seats in the local elections, but Labour is making dramatic progress in London.
Vince Cable says the Lib Dem leader took a "gamble" by campaigning on Europe, while Lynne Featherstone says her party has lost its "humanity".
The party should be straight with voters about how different types of migration have different impacts on Britain.
Cameron fears the collapse of the coalition. Labour fears a more popular centre-left leader.
Something changed in me during my trip to Edinburgh. It is hard to articulate the subtle, often contradictory emotions that constitute a sense of national identity.
Tim Wigmore visits Stoke-on-Trent to investigate the reasons for the BNP's decline - and wonders whether Ukip stand to benefit.
Targets are missed on two fronts, with net migration up by 212,000 and borrowing up by £1.9bn.
One day Nigel Farage will occupy the same position in our cultural memory as Chris Eubank. But until then, the left must stand up to Ukip.
The party needs large gains to demonstrate that it can win the general election and to compensate for possible defeat to Ukip in the Europeans.
Labour's preoccupation with policy too often resembles a displacement activity to avoid the thornier issues of leadership and economic competence.
The party's pledge to build 300,000 homes a year is barely known.
It's not anti-immigrant populism Scots are immune to, it's English nationalism.
The Labour leader won't U-turn if Ukip win the European elections.
The Chancellor's denouncement of those who want to "pull up the drawbridge and shut Britain off from the world" applies to a significant number in his own party.
A new poll shows the party trails in 25 must-win Conservative seats.
Labour leader will travel across five regions to promote ten "cost-of-living" pledges.
How a rape accusation has destroyed the Socialist Workers Party – whose members have included Christopher Hitchens and Paul Foot – and provoked a crisis on the far left.
There are some sectors that could easily afford to pay workers more.
The Labour leader is being pushed to be less ambiguous in his criticism of the Ukip leader.
David Cameron likes to boast that there are more women in the workplace than ever. But for too many, life is getting harder.
The latest polls all show the Scottish independence campaign losing ground.
AstraZeneca rejects Pfizer's final offer for the company.
The minimum wage will rise faster than median earnings over the next parliament.
By acknowledging where we went wrong and setting out a different approach, Ed Miliband has given us a route back into the national conversation.
Mutuals are best placed to initiate a system of healthcare that delivers personalised, holistic care in a cost-effective manner.
Party president also says Lib Dems will not withdraw from the coalition.