Potential GOP presidential candidate Sarah Palin turned down a chance to speak at the prestigious Herzliya Conference this week, abandoning her plan to visit Israel early this year. "She was invited; the president was invited,” a conference spokesman said, according to the Washington website The Hill. “All of the top people in the U.S. were invited. But it's not as if her attendance was imminent or expected." Palin's advisors have not commented on her no-show. The former Alaska governor reportedly planned to visit Israel early this year to try to improve her image of being poorly informed on foreign affairs....