Cameron needs to keep the momentum going in tonight’s Question Time
Tonight’s Question Time is, probably, the most important TV event of the campaign. The fact that it is on BBC1 in prime time means that it is likely to attract a bigger audience than the previous debates. That it is on the BBC also means that any newsworthy moments will be pumped out across the BBC’s entire network from local radio to the world wide web. But what really makes tonight so important is how many undecided voters there still are. Today’s Mail poll has 40% of those going to vote saying that they are either undecided or might yet change their mind. The parties seem to agree that around