Excellent article: ProPublica is a treasure.
Whatever policies Bloomberg may publicly espouse, it seems fairly clear where his sympathies lie and considerably less clear he would not follow them when push comes to shove as it must in this country.
ETA: multiple problems with oligarchy aside, the main issue with Bloomberg in this election cycle is his intimate relationship with the financial sector and the problems that sector has caused this past half century. As Paul Krugman argues
…there is no evidence that Wall Street’s mega-expansion made the rest of the economy more efficient. On the contrary, growth in family incomes slowed down as finance rose — although a few people became immensely rich. And the runaway growth of finance set the stage for the worst economic crisis since the Great Depression. …
And here’s the thing: Financial reform, unlike health care, is an area in which it might make a big difference which Democrat becomes president. It’s true that other candidates — including Bloomberg! — have endorsed Warren-type reforms. But it is, I think, fair to ask how committed they would be in practice, …
Paul Krugman
PS: It may help to recall that Bloomberg supported Scott Brown against Elizabeth Warren in the MA senatorial race.