SIMI VALLEY, Calif. - Rudy Giuliani dropped out of the Republican presidential campaign on Wednesday and endorsed Sen. John McCain for the nomination. Giuliani made the announcement at the Ronald Reagan Presidential Library a day after suffering a debilitating defeat in Tuesday's Florida primary. With McCain at his side, Giuliani said the nation needed "someone who can be trusted in times of crisis." "Obviously I thought I was that person," the former New York mayor said. "The voters made another choice." He noted that he and McCain had managed to compete without running negative ads against each other and said,...