Associated Press: President Barack Obama is encouraging college graduates to keep up the fight against climate change. The president is expected to issue a call to action on global warming in a commencement address Saturday at the University of California, Irvine. Earlier this month, he announced a contentious plan to cut pollution from power plants. Obama also plans to raise money for the Democratic National Committee at a closed-door fundraiser at a private home in Orange County. He's spending the rest of the...