Steyer has been on Trump since day one.

I voted Bloomberg because of Bloomberg's unique social position and ability to get beneath Trump's skin like no other candidate. Bloomberg has exactly zero fear of Trump, and he knows where Trump's vulnerabilities are and is hitting them by subtly humiliating him. Trump would rather you fear or hate him than laugh at him. Bloomberg will be doing a lot of laughing. I'm hoping that through Bloomberg's ads we all learn where Trump's real vulnerabilities are and laugh at him as well rather than fear him (or, to put it more precisely, try to conceal our fear at least until november).

Secondly, Bloomberg has promised to support the Democratic nominee no matter who, and to throw his 1,000-person strong campaign machine (and all the data and research that comes with it) behind that candidate, in addition to the potentially billion + war chest.

"In God we trust. Everyone else bring data." - Bloomberg

We could use that data!