BEN SMITH: Donald Trump Will Dominate The Democratic Primary. Elizabeth Warren Just Showed Him How.

Warren’s decision to launch her campaign on Donald Trump’s terms is not going to discourage him.

And it’s easy to see how Trump will keep weighing in. The most obvious path is simply tweeting — he can live-tweet speeches and debates, comment in the early morning hours on a candidate’s looks or conduct, the usual. The other, which he’s begun to try out, is to try to revive the flagging media interest in court gossip by talking about the Democrats to his sieve-like staff and watching it leak into the press as a catalog of his “views” on the candidates. There even seems to be a race to figure out the nicknames he’ll attach to each, something to which commentators — in this moment of a bipartisan suspicion that the president has magical political abilities — attach totemic power.

Candidates, meanwhile, will not exactly have their feelings hurt by a mean tweet. Anyone who has the misfortune of having her email full of quarterly fundraising requests from Democrats knows there’s no better subject line than “The President Is Attacking Me” to harvest credit card numbers. And in a crowded field, Trump will have the power to elevate his targets.

What’s more, Trump and the reporters covering him will be bound by an eternal truth of presidential campaign coverage: Re-election campaigns are grindingly boring.

That last line is so far removed from reality that I think it must be Smith’s tell that he believes Trump will win in 2020.