Both of his signature issues are leftists' darling, so I'd say he will hurt Dims more. I expect, though, Hillary will run as a 'fiscal conservative' candidate, by touting her economic records during the first terms (at the time, they were known as Bill-Hill. Now, Hill-Bill.)
Why didn't Bloomberg run for NY Governor? This guy is delusional if he really believes he could win the presidency.
Sure sounds like another former NYC mayor we know.