ATF acting head Ken Melson stepped down Tuesday amid a probe into the ill-fated Fast and Furious gun tracing program. But Congressional investigators believe there's more blame to go around.
A June 22 runoff awaits for South Carolina's Nikki Haley.
Recent Democratic presidents have had an uneasy relationship with the armed forces. Obama’s visit to Fort Hood’s memorial service could set the tone for a new rapport with those in uniform.