Their system was deliberately targeted at swing voters; i.e. people who were "fundamental"ly unsure. It's just a numbers game like sales, you may not always be

Their system was deliberately targeted at swing voters; i.e. people who were "fundamental"ly unsure. It's just a numbers game like sales, you may not always be able to influence one particular voter but you can nudge a swing population X number of percentage points in your favoured direction.