Jindal, Santorum, Walker, Perry Add Support to Cotton's Iran Letter

A sudden litmus test for the prospective 2016 presidential candidates has emerged.

US Republican Governor of Louisiana Bobby Jindal speaks at the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, on March 15, 2013.

Photographer: Nicholas Kamm/AFP/Getty Images

A sudden litmus test for the prospective 2016 presidential candidates has emerged: Was Arkansas Senator Tom Cotton's letter to the leaders of Iran worth signing? 

To continue reading this article you must be a Bloomberg Professional Service Subscriber.