In search of Hispanic votes and a long-shot immigration overhaul, President Barack Obama on Tuesday stood at the U.S.-Mexico border for the first time since winning the White House and declared it more secure than ever. He mocked Republican lawmakers for blocking immigration over border security alone, saying they won't be happy until they get a moat with alligators along the border. "They'll never be satisfied," he said. Stymied by both chambers of Congress, the president ditched lawmakers in favor of voters who might pressure them, making an appeal to the public on a hot and dusty day far outside...