No knockout blows on either side, but will the first live TV debate of the campaign help Corbyn close the polling gap? Matt Singh, founder of Number Cruncher Politics, gives his take. Plus - how to capture the don't-knows? Bloomberg's senior executive editor David Merritt and head of the U.K. Government team, Tim Ross, join Bloomberg Westminster's Sebastian Salek and Roger Hearing to look at what drives people to vote.

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