It’s the third and final debate between the leaders of Britain’s main political parties but the contest risks being overshadowed by the fallout from Gordon Brown’s gaffe.
But all eyes will likely be on Nick Clegg’s performance.
The Liberal Democrat leader has seen his popularity surge since the first debate and polls suggest he’s turned the campaign into the first real three way battle for more than 30-years.
Tonight’s debate will focus on the economy, and Conservative leader, David Cameron, whose party leads in all polls, will be looking to put some clear distance between himself and his rivals.
Despite Britain’s huge deficit and slow growth, Brown’s slip-up is hogging the headlines.
Yesterday he was caught calling a Labour party voter “bigoted” after she challenged his government’s immigration policy.
Brown later apologised but the incident has made the woman’s niece think twice about which party to support.
"Bigot" gaffe haunts Britain's PM ahead of debate