David Cameron, Nick Clegg and Gordon Brown during the 2010 general election debate broadcast by Sky News
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Election 2015: Debates 'daunting' for party leaders

Party leaders will be under pressure to perform in the live TV election debate, a leading academic has said.

After the three-way debates between the Conservative, Labour and Liberal Democrat leaders in 2010, the showpiece event of this year's campaign is a seven-way debate including Plaid Cymru, SNP, the Greens and UKIP taking place on Thursday.

Dr Stephen Cushion of Cardiff University, who will be examining its impact for a project monitoring campaign coverage, said there was a lot at stake.

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