This is politics in the United States, and it has been for decades. Hager busted a small part of it in New Zealand, and now National have gone all gun-shy while the left are getting dirtier and dirtier.
A National MP went to the US not so long ago to observe how these campaigns are run, and he came back with lots of new information and ideas.
And that’s all they will remain.
At some point National will lose and until they step up to the next level of political warfare, they will find themselves in a hole, just like Labour is now.