Steyer Won't Run for Senate

Democratic donor's decision likely opens the door for the state's attorney general, Kamala Harris.

Tom Steyer speaks at Global Green USA's Millennium Awards at Fairmont Miramar Hotel on June 8, 2013 in Santa Monica, California benefiting the places, the people and the planet in need.

Photographer: Charley Gallay/Getty Images for Global Green

Tom Steyer, a San Francisco billionaire and a heavy-hitting Democratic donor, has decided not to run for a U.S. Senate seat, saying he'd rather focus on electing a Democratic president and working on climate change and other issues from his home state of California.

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