If Christie continues to indulge his penchant for lashing out and doing whatever the heck he pleases, any presidential campaign of his risks becoming a game in which reporters wait to see how long it takes for someone — a voter at a town hall in Iowa, New Hampshire or South Carolina, perhaps — to provoke an explosion. Impatient reporters might even pose impertinent questions themselves, trying to cause Christie to erupt. Neither scenario would be appealing — or particularly useful in evaluating the qualifications of a candidate for the presidency.