Hill: Lawmakers and campaign consultants say billionaire environmentalist Tom Steyer is causing some anxiety for Democrats ahead of the midterm elections. Steyer, founder of the green group NextGen Climate Action, has risen to the forefront of political donors after throwing $8 million behind Terry McAullife to clench the Virginia gubernatorial race. But lawmakers and campaign consultants are worreied about Steyer's criticism of politicians, including Democrats, who don't back his campaign to kill the...