Before revision:  In this letter , we focus on the effect of multivalent co-ions, specifically divalent coion such as SO_4^{2-} , on the strongly correlated electrostatics of DNA condensation problem .
After revision:  In this papers , we focus on the effect of multivalent co-ions, specifically divalent coion such as SO_4^{2-} , on the strongly correlated electrostatics of DNA condensation problem .