The leaders of the UK's three main political parties are going head-to-head in the first televised leaders' debate, which is being broadcast on ITV1.
The assembled press watch the debate backstage at Granada Studios in Manchester.
The first of the three debates is focusing on domestic issues. So far, immigration, crime, education and MPs' standards have been debated.
Thousands of people are commenting on the debate on micro-blogging site Twitter, with an estimated 100,000 posted in the first hour.
Mr Clegg, who won the draw to make an opening statement first, told the studio audience "I believe the way things are is not the way things have to be" and urged voters to "do something different this time" by voting Liberal Democrat.
Gordon Brown, in his opening statement, warned against a "double dip recession" and vowed to protect the NHS, police and schools from cuts.
David Cameron promised to restore trust after the expenses scandal and said although he would not undo everything Labour had done, Britain needed change "and it is that change that I hope to lead".
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