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John Pienaar is in the Oldham East and Saddleworth constituency in the run-up to this Thursday's by election.

It's a huge test for the coalition and the Liberal Democrats in particular. Can the Lib Dems defy their poor showings in the national opinion polls to win the seat? Will Labour voters stay loyal? Or could the Conservatives come from behind to snatch victory?

John talks to top politicians about all the issues.