Billionaire Tom Steyer’s lefty staff brutally mocked him in now-deleted tweets

Billionaire Tom Steyer’s lefty campaign staff — before cashing his checks — were brutally heckling the California governor hopeful in comments and tweets that have since been scrubbed from the internet, The California Post has learned. Steyer, the billionaire-turned-populist who’s called for higher taxes on the rich, was a frequent punchline for one partner at The…