Westminster is awaiting the news on the election results, the cabinet reshuffle and the attempt to force Gordon Brown's resignation.
The three pieces in a complex political jigsaw now hold the key to the prime minister's position.
Local and European election results are expected to be damaging for Labour.
But they may also deliver disappointing news for the other main Westminster parties, as voters vent their anger at the expenses scandal by supporting smaller parties.
Meanwhile, a poor Labour showing could prompt more of the party's MPs to sign up to an email which calls on Brown to step down as party leader.
While it is not clear how many people have signed up to the email, it states: "We are writing now because we believe that in the current political situation, you can best serve the Labour Party and the country by stepping down as party leader and prime minister."
The backing of 71 of Labour's 351 MPs are currently needed to mount a leadership challenge, and the email states that the names of signatories will not be published until there is at least 50.
The prime minister could seek to reassert his authority in the forthcoming reshuffle, which comes in the wake of the resignations of Jacqui Smith and Hazel Blears.
However, chancellor Alistair Darling is reported to be resisting any move from the Treasury and could resign if forced to accept an alternative post.
And any bid to place Ed Balls in Number 11 could stoke further controversy, potentially encouraging more MPs to sign the resignation letter.
There has also been speculation that other junior ministers could also announce their resignations.
Business secretary Lord Mandelson, meanwhile, urged Labour MPs not to rebel.
He told the BBC: "I know there are Labour MPs who are in a very grumbly mood, but British politics is in a bad old state.
"Nobody is happy and it is affecting all the parties. Don't please, through your actions, make it any worse for the Labour Party."
Dods Parliamentary Communications Ltd