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
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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?

One day after a controversy erupted in Washington over a letter organized by Cotton, signed by 46 of his Republican Senate colleagues, and sent to Iran's leaders warning them against a nuclear deal with the Obama administration, three more Republican presidential hopefuls added their support, while the Democratic frontrunner took the legislators to task.