National Party urges supporters not to split their vote

The National Party is trying to save itself from its own supporters - stepping up its campaign against so-called strategic voting. For one, it's parachuted in former leader - Sir John Key - to try rally the troops. It also appears to have complained to the Electoral Commission about the right-wing Split Your Vote campaign - at least that's what its creator Harry Mowbray reckons. Deputy political editor Craig McCulloch reports.