Is 2018 the most racist US midterm election campaign ever?
- Donald Trump tweeted an incendiary video that stoked panic about migrants
- 2018 midterm elections have revealed an extraordinary proliferation in the sort of extremist rhetoric that now passes for political campaigning

In the United States, political advertising is often laced with venom.
From the Nixon-Kennedy attack ads of 1960 to the Romney-Obama clashes of 2012 this unique, aggressive form of campaigning has a long history, protected by the first amendment.
But rarely, if ever, has a president endorsed advertising as nakedly divisive and overtly racially prejudiced as has been seen this year.
Last week, Donald Trump tweeted an incendiary video that stoked panic about migrants and falsely claimed Democrats were responsible for the murder of two police officers in California.
The 53-second video was produced by a consultancy firm in Washington responsible for other rightwing ads.
It depicts Luis Bracamontes, who was in the US illegally when he murdered the officers in Sacramento in 2014.