article_snippet: Will an Iranian rush toward the bomb set off a nuclear arms race, starting in Saudi Arabia, which is already taking preliminary steps?
article_snippet: Will the United States then be compelled to use military force against Iran?
article_snippet: What we do know is that Iran is now almost certain to become a central issue in the 2016 presidential campaign and that the Republican nominee will be under relentless pressure from the right to adopt a hard, unyielding line.
highlights_snippet: David Gergen: Iran almost certain to become big issue in 2016 campaign .
  