Billionaire Democrat Tom Steyer says he won't run for office this year: 'That's not where I can make the biggest difference'

San Francisco billionaire and major Democratic donor Tom Steyer said Monday he’s not going to run for Senate or the governor’s office in California this year, ending months of speculation about his future.

“I'm not going to run for office in 2018 — that's not where I can make the biggest difference,”...