Miles from Washington, President Obama on Wednesday tried to persuade people that they should care about keeping the government open — because if it shuts down, they won’t be able to walk around national parks. Obama told clean energy workers in Pennsylvania that some of them are probably thinking, “What do I care?” They should care, he said, because a shutdown would stall small-business loans and mortgage work. And, if any of them wanted to vacation at Yellowstone National Park, “you're out of luck,” Obama said. “You may have to figure out if you can get your money back,” he...