article_snippet: This conflict began on a personal level.
article_snippet: But in recent months what began as personal antipathy has deepened and widened into a serious split over the best way to head off Iran's aggressive push to become a nuclear power.  
article_snippet: This is only the beginning of a long litany of differences.
article_snippet: But today's rift seems far more perilous.  
article_snippet: It is not only personal but substantive and comes at a moment of spreading turmoil across the Middle East.  
article_snippet: In short, the moment is dire but not hopeless.  
article_snippet: Others should now take up the cause, recognizing that our real adversaries are not in Tel Aviv or Washington but among those in Teheran who support terror and mayhem across Middle East.