Here's a brief look back at some of the main stories of the day:

Reaction to and discussion of last night's leaders' debates ran throughout the day, with a big emphasis on who would and would not do deals with whom - and what the "red lines" would be in any coalition negotiations.

Tonight, Ed Miliband told a Labour rally in Glasgow he would not do a deal with the SNP after the election because "nationalism never built a single school, or lifted people out of poverty".

The Conservatives campaigned on their economic record, brought out "that note" left by Liam Byrne when he left the Treasury and said they would not cut child benefit during the next parliament.

Nick Clegg set out a further red line for any coalition deal - a commitment to spending an extra £8bn a year on the NHS in England.

The SNP and Plaid Cymru both criticised Ed Miliband's comments on coalitions.

UKIP leader Nigel Farage said he could see his party providing votes to a Conservative/Lib Dem coalition.

We'll be back in the morning with the latest election news.

Facebook conversations are lighting up the London Eye. Every evening until polling day, colours reflecting which parties are featuring on the social network will be displayed on the London landmark. Facebook says that since January, there have been 52 million interactions about the poll on its pages.

Image source, Getty Images

Labour party candidate Rupa Huq has been photographed being grabbed from behind by a Conservative Party activist after she approached London Mayor Boris Johnson during campaigning in west London.

Dr Huq is standing in the marginal seat of Ealing Central and Acton. A full list of candidates standing in the constituency can be found here.

Boris Johsnon is standing in Uxbridge and Ruislip South and a list of all candidates can be found here.

Image source, Getty Images

Plaid Cymru leader Leanne Wood, speaking on the Leaders' Debate in Wales, says she would like to work with Labour to prevent a Conservative government from coming into office.

The NHS, the cost of living and immigration were the three top priorities for people opting to take part in a readers' survey by Grazia magazine, external .

Plaid Cymru's Leanne Wood says Labour has been "highly irresponsible" in choosing to "lock out" her party and the SNP from any post-election deals. Labour's Owen Smith responds, saying his is the only party not "obsessing" about deals. Don't take our support for granted, Ms Wood responds.

In my mailbag, there are constituents who write every single week about the challenges of the NHS, says the Conservative Stephen Crabb. You should see the language voters themselves use in their letters, he says.

I know women with three jobs struggling to make ends meet, says Pippa Bartolotti from the Greens. She urges women to get involved in politics and close the gender pay gap.

Commenting on the leaders' debate in Wales tonight, Professor Scully said:

The leaders' debate for Wales is underway and can be watched using the live tab above.

Live reporting on what's being said can be found here.