Trump will dominate the Democratic primary. Elizabeth Warren just showed him how.

As Democrats look toward a presidential primary that will begin in earnest approximately 11 seconds after the midterms, candidates should be ready for a new reality, and the media for a new challenge.

The reality is that the most important pundit, commentator, and great mentioner of the 2020 primary will be President Donald Trump.

And the challenge for the media will be whether or not to let him dominate the Democratic primary.

Democratic voters got an early sense of this when they woke up Monday morning to a slickly-produced video from Elizabeth Warren about her DNA. The first 19 words in the video are spoken, sneeringly, by Donald Trump. The rest of the video answers a question Donald Trump raised, takes a piece of bait he’d laid out and Warren furiously, seeing no other option, took as a symbol of her willingness to “fight.”