Republican Candidates: Liars or Lunatics?

Republican presidential candidates are day one divas.  In 2012 Romney promised to repeal Obamacare on his first day in office.  Not to be outdone,  Walker has promised to repeal the Iran Treaty after swearing the oath of office.  Rubio, Cruz and Bush echo those sentiments.

Are they too young to remember "One (is the loneliest number)" by Three Dog Night?  Neither Russia and China, nor our allies, would renege on the agreement.  It is a near miracle that Hillary Clinton cobbled, and held, together the sanction odd fellows.  We would stand alone with useless unilateral sanctions and no ability to enforce constraints on Iran.

If by some miracle,  a Republican president could rebuild the sanction alliance, Iran would have between a 100 and 150 billion dollars and no treaty obligations.  Is this crop of Republicans just spreading  fertilizer?   I hope so.  Better duplicitous than dumb.