Not only will Burlingame be the center of the Republican political universe for three days starting Friday, when White House presidential hopefuls Donald Trump, Ted Cruz and John Kasich speak at the state Republican Convention, but some Democrats are taking advantage of the media spotlight shining on California, too. Billionaire San Francisco environmental activist Tom Steyer launched an 30-second ad Thursday ripping Cruz and Trump for their dubious attitudes toward climate change and urging people to vote against them. On Monday, the former hedge fund manager has announced his NextGen Climate Action super PAC would spend $25 million this year...