The NYT reviews Bloomberg’s ad blitz:

The effort, which is targeting seven battleground states where polls show Mr. Trump is likely to be competitive in November, is just one piece of an advertising campaign that is unrivaled in scope and scale. On Facebook and Google alone, where Mr. Bloomberg is most focused on attacking the president, he has spent $18 million on ads over the last month, according to Acronym, a digital messaging firm that works with Democrats.

That is on top of the $128 million the Bloomberg campaign has spent on television ads, according to Advertising Analytics, an independent firm, which projects that Mr. Bloomberg is likely to spend a combined $300 million to $400 million on advertising across all media before the Super Tuesday primaries in early March.

Those amounts dwarf the ad budgets of his rivals, and he is spending at a faster clip than past presidential campaigns as well. Mr. Bloomberg is also already spending more than the Trump campaign each week to reach voters online. And if the $400 million estimate holds, that would be about the same as what President Barack Obama’s campaign spent on advertising over the course of the entire general election in 2012.