Policy substance has been missing in action during this election campaign. Complex, bold plans have been thin on the ground. And on some issues, the differences between the parties' positions is slight. With the election just around the corner, Insight gathers together some big thinkers to talk about what they've made of the campaign, what's been missing, and what their one big idea would be to make Australia better. And our undecided voters from Australia's most marginal seats will tell us whether they're any closer to actually making a decision.