Democratic megadonor Tom Steyer might not be a household name, but he’s not ruling out a 2020 presidential run or a 2018 run for California governor.In a recent interview, Steyer expressed skepticism at House Minority Leader Nancy Pelosi and Senate Minority Leader Chuck Schumer’s deal-making with President Trump. And he talked about how fes his background as a former hedge-fund manager with a Democratic Party whose progressive grassroots insists big money should be driven out of politics.Steyer has spent years as an environmental activist advocating for climate action and bankrolling Democratic candidates who do the same.